Motivated by the recent synthesis of Ba2CuO3+δ (BCO), a high temperature superconducting cuprate with putative d3z2−r2 ground state symmetry, we investigated its electronic structure by means of Cu L3 x-ray absorption (XAS) and resonant inelastic x-ray scattering (RIXS) at the Cu L3 edge on a polycrystalline sample. We show that the XAS profile of BCO is characterised by two peaks associated to inequivalent

This paper shows the effect of the Josephson and bi-quadratic coupling types on the vortex state, the magnetization in a two-band superconducting disk in the presence of an external magnetic field and the effect that the γ value has on the vortex state. This study is based on the two bands Ginzburg-Landau time dependent theory, and the main properties are presented via Ab-Initio of MgB2. The superconducting

In this paper, a square central crack problem is investigated for an infinitely long square cross section superconducting column under electromagnetic forces. The generalized Irie-Yamafuji critical current densities model and the magnetically impermeable crack surface condition are adopted for both the zero-field cooling (ZFC) and the field cooling (FC) activation processes. The distributions of magnetic

3D integration has well-developed for traditional CMOS technology operating at room temperature, but few studies have been performed for cryogenic applications such as quantum computers. In this paper, a wafer-to-wafer bonding of superconductive joints based on niobium nitride (NbN) is performed to demonstrate the possibility of 3D integration of superconducting chips. The NbN thin films are deposited

We investigated the combined effect of flux pinning by three-directional columnar defects (CDs) in a wide field-angular range of YBa2Cu3Oy thin films, where CDs parallel to the c-axis and CDs crossing at ±θi (θi = 45°, 60° and 80°) relative to the c-axis were installed by 200 MeV Xe-ion irradiations. The three-directional CDs with θi ≤ ±60° form a field angular curve of critical current density Jc

In order to study the feasibility of the co-transmission of electricity and liquefied natural gas (LNG) based energy fluid, we carried out a project supported by a grant from Chinese national key research and development program, Basic Research on Superconducting DC Energy Pipeline. In this project, a superconducting cable cooled by LNG based mixed energy fluid at temperature around 90 K is proposed

Cross stiffness is usually defined as a change in the vertical force when the levitating body moves a small lateral displacement in a high-temperature superconductor (HTS) magnetic levitation system. In most of the existing research reports, the improvement of the levitation stiffness is usually focused on the radial (lateral) and axial (vertical) stiffnesses. The cross stiffness should be studied

We investigate the nonequilibrium pair density wave order parameter in a simple microscopic model with the ground state d− wave spatially uniform superconductivity. After pushing the system out of equilibrium by a short-time induced order parameter, the system can exhibit robust free nondecaying oscillations of nonuniform superconducting order. In the weak nonequilibrium regime, the frequency of these

We present a strong-coupling study of the competition and interplay between the d-density wave (DDW) and d-wave superconducting (DSC) states within the fluctuation-exchange approximation for the two-dimensional Hubbard model. We find the occurrence of a new DDW state with phase fluctuations induced by spin fluctuations above TC. It is shown that in this state the density of states has a pseudogap,

We observe a hysteretic superconducting switch effect in NbSe2 - CrGeTe3 superconductor/ferromagnet bilayer structures. The switching effect occurs robustly at perpendicular external magnetic fields between 80

In the present study, Mg diffusion process has been investigated by transport measurements and surface morphology analysis in round MgB2 wires made with internal Mg diffusion (IMD) method. These wires were produced using semi-amorphous boron, nano-sized amorphous boron or mixtures of them via cold drawing process. In addition to the conventional IMD wire production technique, a thin layer of magnesium

Based on a model Hamiltonian including the on-site repulsive interaction among the electrons, we investigate the flux-dependent evolution of mixed pairing orders in mesoscopic superconducting square loops by numerically solving the Bogoliubov-de Gennes equations. The influence of centered hole size on the order modulation is mainly discussed. For the emergent spin-triplet p-wave and subdominant spin-singlet

The evacuated tube side-suspended high-temperature superconducting (SS-HTS) magnetic levitation prototype vehicle can run at high speed on a uniform permanent magnet guideway due to the characteristics of magnetic flux pinning. However, permanent magnet guideway with magnetic fluctuations will cause resistance in the running direction of the high-temperature superconducting maglev prototype vehicle

To study a nonlocal electron transport in an aluminum superconducting quasi-one-dimensional structure, we measured negative nonlocal (local) direct current voltages in the structure in a magnetic field near the critical temperature. The structure is a normal-superconducting at Tcn

Relation between the binding energy of pair of fermions and the magnitude of the attractive interaction between them is investigated theoretically with the help of mean field approximation, for a two-dimensional (2D) Fermi liquid type superconducting material. Here the fermion pair has finite center of mass momentum (CMM). The fermion pair is considered to be formed in the presence of an active Fermi

In this study, we have constructed an extended version of Ginzburg-Landau theory of superconductivity starting from the exponential non-standard Lagrangian. An extended Ginzburg-Landau coherence length and an extended Ginzburg-Landau parameter emerge in the theory without affecting the Abrikosov's fluxoid quantization law. We have discussed the Abrikosov's periodic vortex lattice problem and we have

In Physical Review Letters 102, 197002 (2009), it was reported that the element Eu becomes superconducting in the pressure and temperature range [84-142GPa], [1.8-2.75K]. The claim was largely based on ac susceptibility measurements. Here I point out that recently reported ac susceptibility measurements on a hydride compound under pressure that appears to become superconducting near room temperature

In this paper, we propose a full-wave analysis for characterizing the resonant frequencies and bandwidths of high-temperature superconductor inverted microstrip printed on anisotropic substrates. Our proposed approach is based on Galerkin procedure in the Fourier transform domain (FTD) combining with the complex resistive boundary condition. With the use of suitable Green's functions in the FTD, the

Growth of single crystals of RuGd-1222 ((Gd,Ce)2Sr2RuCu2O10−δ) remains a major challenge, and previous studies have indicated that epitaxial thin films of these compounds exhibit deteriorated superconductivity. We have been working toward the synthesis of RuGd-1222 single crystals using the self-flux and partial melting techniques. In this paper, we report on the synthesis of RuGd-1222 single-crystal

6+1-filament MgB2 long wires with high critical current densities were fabricated using an internal Mg diffusion (IMD) process. The effect of high temperature treatment by conventional furnace annealing and rapid thermal processing on the superconducting properties and microstructure of IMD wire was investigated. The rapid thermal processing can improve the superconducting properties of multifilament

The AC loss occurred in REBa2Cu3Oy (REBCO, RE = rare earth elements, Y, Eu, Gd) superconductor is serious problem in AC applications because it may cause a severe temperature rise of superconducting systems. Therefore, it is necessary to understand the AC loss property of REBCO superconducting tape in detail and to reduce that. As AC application such as motor, the tape is mostly stacked into multi-layer

Multi-layer insulation (MLI) is a crucial component to reduce a heat leak of a cryostat, and it is used for various applications in cryogenics. Its role is significant for the superconducting power transmission line (SCDC) mainly because the ratio of the surface to the volume is large for the conventional cryostat, and the heat leak is a principal source of the loss of SCDC. If we cannot reduce the

The iron-based superconductor (IBS) is considered to have a great potential application under high magnetic field. It is one of the important steps to carry out the research on high magnetic field IBS inserted coil in order to promote the practical application of IBS. We developed a type of Ba122 single and double pancake inserted coils with 35 mm outer diameter, and its performance has been tested

The main goal of this paper is to obtain the exact quantum solutions for charge space in a superconductor with time-dependent parameters using the London approach. We introduce a new quantization scheme for the charge inside a superconductor based on the Lewis and Riesenfeld invariant operator method. From the wave-functions obtained, we calculated the time-dependent uncertainties and the mean energy

We present a review of the leading theoretical approaches in the field of cuprate high temperature superconductivity. We start out by defining the problem and ask the question: whether an overarching theory possible (which is capable of explaining not only the mechanism of unconventional superconductivity but also a coherent understanding of the strange metal phase and the pseudogap phase)? If it is

In this paper, we investigate a local density of state (LDOS) in a two-dimensional nano-structured superconductor. We solve the Bogoliubov-de Gennes equations self-consistently with the two-dimensional finite element method. In the nano-structured superconductor, the LDOS as a function of energy has many discrete peaks. Discretization of the LDOS comes from discretization of energy levels due to the

The penetration of the magnetic field in a network consisting of the superconducting grains and intergranular region depends not only on the applied external magnetic field but also on the underlying pinning force density and fraction of the superconducting grains in the sample. Considering the underlying pinning force density in the form of the repetitive Gaussian (RG) nature we have solved the critical

The increase of current uniformity along of a Resistive type Superconductor Fault Current Limiter (R-SFCL) in the design of this type of limiters is well perceived as an important issue. The non-uniform distribution of current in R-SFCL only increases the current in some superconducting regions, as a result, in the fault conditions, only certain parts of the superconductor undergo a phase change that

A deep understanding of the quasiparticle inelastic scattering rate in superconducting materials is beneficial for the further development of ultrasensitive and rapid superconducting detectors. From the flux flow instability in current–voltage characteristics of NbN superconducting films, we have derived the critical vortex velocity (ʋ*) and quasiparticle inelastic scattering time (τE) of the 10- and

We have fabricated Nb/Al-AlOx/Nb Josephson junctions and have measured their current-voltage characteristics and the two-dimensional magnetic field dependence of the Josephson current. When the external magnetic fields (Hx, Hy) parallel to the junction plane are applied to the Josephson junction from two directions, two Fraunhofer diffraction patterns are observed in the (Hx, Hy) plane. In this study

A like-CORC based on the Quasi-isotropic (Q-IS) conductor, so called Q-IS_CORC consisting of CORC and Q-IS making from 2 G high temperature superconducting (HTS) tapes, is investigated in terms of AC losses by combining experimental with numerical methods. A new type of a like-CORC conductor is presented and is good bending performance as well as easy to manufacture in long lengths. Moreover, this

Today, superconductor materials are widely used in electric machines because of their unique properties. This has been always a question for designers and researchers whether super-conductors can be a good substitute for Permanent Magnet (PM) or not. In this paper, the performance of a dual stator linear vernier machine under identical conditions in the presence of High-Temperature Superconductor Bulk

The temperature and magnetic field dependences of electrical resistivity ρ(Т, Н) and magnetization m(Т, H) of the semiconductor solid solution (Pb0.4Sn0.6)0.8In0.2Te were studied in the temperature range T = 2 K - 300 K (including the region of the superconducting transition of the compound T ≤ 4 K) and in magnetic fields H ≤ 140 kOe. The critical parameters of superconducting transition were determined:

Flux modulated static current-voltage characteristics are the basis of DC SQUID being the flux-to-voltage convertor utilized in high-performance magnetic field measurement systems. Those static behaviors are the results of the internal quantum interference between two Josephson junctions. However, the interferometric working principle and the interference phenomena are difficult to be intuitively visualized

Josephson current between two one-dimensional nanowires with proximity induced p-wave superconducting pairing is calculated in the presence of Rashba spin-orbit interaction, in-plane and normal magnetic fields. We show that Andreev retro-reflection is realized by means of two different channels. The main contribution to the Josephson current gives a scattering in a conventional particle-hole channel

Based on the transfer matrix method and the two-fluid model, this study seeks to calculate the transmittance spectrum of a quasi-periodic one-dimensional photonic crystal (PC) composed of semiconductor (GaAs) and superconductor (HgBa2Ca2Cu3 O8+δ) layers. In particular, the arrangement of the PC layers follows a Thue-Morse sequence with a given periodicity. The critical temperature of the superconductor

A relatively complex model is developed to estimate the effect of the electromagnetic force on fracture behavior in a slab superconductor with a center-situated crack, where the viscous flux flow and flux creep have been considered. The effects of the viscous flux flow and flux creep on the stress intensity factors and flux profiles are discussed for the descending field. The results indicate that

The hybrid magnet system has been completed the commissioning and be ready to serve users at the High Magnetic Field Laboratory of the Chinese Academy of Sciences (CHMFL) in Hefei, China. The hybrid magnet consists of a 28 MW, 34 T resistive insert coils set nested inside of a 800 mm bore 11 T superconducting outsert magnet. The outsert coils are wound with high JC Nb3Sn/Cu cable-in-conduit conductor

In High Temperature Superconducting (HTS) power cable, HTS tapes are wound helically around a circular former and are subjected to different types of mechanical loads during manufacturing, transportation and installation of cable. The strain developed within the HTS tape during these processes may affect the superconducting properties of the tape. In the present work, 3D structural finite element (FE)

In this paper, two types of conceptual structures of 10 MW fully superconducting offshore wind turbine generators (FSWTG) with an efficient electrical design method are presented. Four types of generator models, Gen. A - D, are compared according to different armature winding structures, and it's found that Gen. A is the preferable one. Optimization of the main generator parameters reveals that 36

In the framework of the microscopic Bogoliubov-de Gennes theory, we investigate the topological defect states in mesoscopic chiral p-wave superconducting rectangles. In the absence of applied magnetic field, stable multi-domain-wall states containing two or more domain walls can be obtained with the increase of the aspect ratio of the rectangle at zero temperature. When the external field is applied

HTS magnetic bearing is one of the important applications of HTS suspension system. It is a relatively complicated problem to describe the relative motion of superconductor and permanent magnet in the numerical calculation of HTS suspension system. For this problem, firstly, this paper analyzes the characteristics and limitations of the existing methods, and then proposes a new solution: using the

We have designed a multi–surface HTS (high temperature superconductor with three seeded bulk YBaCuO) Maglev system by increasing the YBaCuO number while decreasing the PM number in HTS–PMG system to enhance the loading capacity and stability of the superconducting Maglev system while reducing the fabrication cost. By this study, a detailed investigation on the magnetic levitation force, guidance force

Three (MgB2)1-x(SnO2)x samples with x ranging from 0 to 5 wt% were prepared by the in situ route to study the effect of tin dioxide additions on the superconducting properties of MgB2 bulk materials. All of the reacted samples were slightly Mg deficient although the starting Mg:B precursor powder ratio was 1:2. A heat treatment (HT) temperature of 700 °C with a dwell time of 30 min was used. XRD results

Carbon-doped MgB2 polycrystalline bulk samples were prepared by reacting mixtures of Mg and B powders, with and without 0.5 wt.% of the amino acids glycine, alanine, valine, leucine or isoleucine. The amount of carbon introduced into the MgB2 structure depends on the amino acid and is surprisingly higher for glycine, which has the lowest carbon content among the aliphatic amino acids. The critical

Recently, it has been demonstrated that the Hexatic vortex fluid realized in 2-dimensional vortex state of a very weakly pinned amorphous MoGe thin film is extremely sensitive to external ac excitation. A large amplification of resistance is observed when the sample is exposed to external electromagnetic radiation or a small ac current is superimposed with the subcritical measuring dc current. The

The variation in superconducting and elastic parameters of YBa2Cu3O7-δ (YBCO) superconductor due to addition of Graphene nanoplatelets (GnPs) was examined. All the composite samples (1-x) YBCO + x GnPs (x = 0.1, 0.3, 0.5, 0.7 and 0.9%) were synthesized by conventional solid state reaction route. The structural and morphological characterizations of composite samples were investigated through the X-ray

The operation of a high-temperature superconducting (HTS) device is strongly related to its electromagnetic environment. It is necessary to study the electromagnetic interaction of proximity HTS tapes placed in the horizontal or vertical direction, which is important for the design and optimization of HTS devices. This paper presents a numerical model of periodically arranged HTS tapes using the finite

The carrier transport and the motion of a vortex system in the electron-doped high-temperature superconductors Nd2−xCexCuO4 in underdoped and optimally doped (x = 0.135, 0.145, 0.15) regions, in the area of the evolution from antiferromagnetic to superconducting order were investigated. To study the anisotropy of the transport properties of highly layered NdCeCuO system we have synthesized Nd2−xCexCuO4+δ/SrTiO3

In this paper, a new compact superconducting multiplexer with an extensible modular structure is proposed. The multiplexer consists of a common input feeder and multiple bandpass filters. The common feeder is realized by a transmission line with a characteristic impedance of 50 ohms. Compared with the conventional multiplexer, the proposed length of the common feeder is extensible, making it feasible

In this paper, a compact high temperature superconducting (HTS) multiplexer with improved out-of-band suppression and wide stopband attenuation is proposed. Each passband can be individually synthesized and conducted by using distributing coupling scheme without any additional matching network. The proposed quadruplexer is constructed by four sets of four order bandpass filters (BPFs) with compact

The chemical solution deposition (CSD) is one of the most appealing routes for the growth of high-quality YBa2Cu3O7-δ (YBCO) films due to its advantages of low cost and high efficiency. However, as with other preparation methods such as pulsed laser deposition (PLD), the critical current densities (JC) of YBCO films prepared by the CSD method also dramatically decrease with increasing film thickness

This paper reports an optimal technique to design a fully superconducting motor. A 50-kW-class fully superconducting induction/synchronous motor with both rotor and stator windings was fabricated from bismuth–strontium–calcium–copper-oxide (BSCCO) tapes and quantitatively characterized. The toroidal structure was adopted for the stator windings in order to increase their critical current in the iron

Effects of proton irradiation on the superconducting properties of sintered MgB2 samples were investigated as a function of proton fluence at fixed energy. All experimental data suggest that critical current densities, irreversibility field and creep activation energy are enhanced because of the complex disorder, which mainly affects the grain boundaries, brought on the crystalline structure by the

In the present study, in order to clarify the electrical and mechanical properties of the junction of superconducting wires, a junction was numerically simulated using the finite element method, and the electrical and mechanical properties were evaluated. We used a 1 µm-thick YBa2Cu3O7−δ superconducting coated conductor to act as a superconducting wire and joined two films together for current density

We have investigated the substitution effect of Eu on the superconductivity in La2-xEuxO2Bi3Ag0.6Sn0.4S6. Recently, we reported an observation of superconductivity at 0.5 K in a layered oxychalcogenide La2O2Bi3AgS6. The Sn doping at the Ag site was found to raise the superconducting transition temperature, Tc, to 2.5 K in La2O2Bi3Ag0.6Sn0.4S6. To further improve the superconducting properties, we have

The discovery of superconductivity of MgB2 has attracted considerable research attention. Further exploration and discovery of MgB2-like superconductors are important to determine the properties of MgB2 and enhance our understanding of the superconducting mechanism. Four MgB2-like MgXB4 (X = Al, Li, Na, K) superconductors based on an MgB2 structure were designed in this study. The electronic structure

Recent theoretical and experimental studies demonstrated that an electromagnetic metamaterial approach is capable of drastically increasing the critical temperature Tc of composite metamaterial superconductors. This progress was achieved by engineering the frequency-dependant dielectric response function of the metamaterial. Here we further extend this approach by introducing the concept of hybrid

Residual stress and internal strain induced by interface lattice mismatches between YBa2Cu3O7-x thin films and substrates causes variation on microstructures and superconducting properties. In this research, we investigated small misfit misalignments of YBa2Cu3O7-x thin films prepared on (LaAlO3)0.3-(Sr2AlTaO6)0.7 (LSAT), LaAlO3 and SrTiO3 substrates, and their resulting effects on their superconducting

A nano size pyramidal superconducting tip is characterized theoretically. Vortex states are achieved in the framework of three-dimensional (3D) numerical discretization of Ginzburg-Landau (GL) formalism. Systematic investigation is performed according to the geometric parameters of the tip and different GL parameter κ. Meissner state and critical field of the tip are obtained in the presence of external