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

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

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

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 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

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

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

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

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

The features of the irreversible propagation of thermal instabilities in composite superconductors are investigated under different cooling conditions (intensive and non-intensive) during magnetic flux creep. The analysis was performed with two models of the voltage-current characteristic of a superconductor: an ideal model having a jump-like transition from a superconducting state to a normal, and

The phonon nature and superconductive properties of Zirconium chalcogenides (ZrS and ZrTe) in WC-type structure are evaluated leveraging density functional theory of first principles. In the WC-type structure, the phonon frequencies are positive in the Brillouin zone suggesting their stability in that region. The calculated zone center phonon dispersion curves and phonon density of states for ZrS and

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

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

The relation between pseudogap (PG) and superconducting (SC) gap, whether PG is a precursor of SC or they coexist or compete, is a long-standing controversy in cuprate high-temperature supercondutors. Here, we report ultrafast time-resolved optical reflectivity investigation of the dynamic densities and relaxations of PG and SC quasiparticles (QPs) in the underdoped Bi2Sr2CaCu2O8+δ (Tc = 82 K) single

Changes of the electron work-function of a superconductor proportional to the square of the current density Δϕ=−βj2 are known as Bernoulli effect in superconductors or current induced Contact Potential Difference (CPD). The temperature dependent coefficient β(T; m*) is parametrized by the effective mass of Cooper pairs m*. In such a way the study of the Bernoulli effect leads to creation of Cooper

In the presented work, ab initio pseudopotential calculations have been realized on structural, electronic, elastic, mechanical, phonon and electron-phonon interaction properties for ZrRuAs with the hexagonal ZrNiAl-type layer crystal structure. In the vicinity of the Fermi level, Ru 4d and Zr 4d states dominate and mainly contribute to the conduction properties of ZrRuAs. A critical assessment of

In this work, we study the magnetic impurity resonance states in monolayer FeSe superconductor for different pairing symmetries. When the magnetic impurity is hybridized to one of the two electronic pockets at M point, we find that there will be two in-gap resonance peaks located symmetrically at the two sides of the Fermi energy. The intensities of the two peaks are comparable for s-wave and d-wave

A new nonlocal phenomenological theory of superconductivity is discussed based on extension of the quantum momentum operator which is one of the main consequences of nonlocal-in-time kinetic energy. The nonlocal Ginzburg-Landau equations are derived from the extended nonlocal pair-superconductor total free energy and a number of properties are discussed. A microscopic nonlocal quantum formulation of

The BCS universal ratios such as the gap ratio and superconducting jump of the electronic heat capacity normalized to its normal state value are calculated using a simple single-electron model with equal level spacing. The BCS theory predicts that the size dependence of these ratios can be observed in nm-sized clusters if Tc/ωD < 0.1, where ωD is the Debye energy. Under these conditions, the values

Superconducting Nb3Sn thin films have been produced on copper substrate by dc magnetron co-sputtering technique successfully. XRD and magnetic moment measurement demonstrate the exist of Nb3Sn crystal. By changing the ratio between niobium target sputtering current to tin target, the tin concentration in different films is varied. However, the experiment results indicate critical temperature TC of

The second-generation (2 G) high temperature superconducting (HTS) conductor is widely used in high-field magnets and power transmission cables and its AC loss is one of the main obstacles. This paper mainly analyzed AC losses of twisted quasi-isotropic conductor stacked by 2 G HTS tapes and copper tapes by simulation and experimental methods at 77 K. A twisting apparatus was designed and manufactured

The usage of high-temperature superconducting (HTS) coils in magnetically-coupled resonant wireless power transfer (WPT) systems can considerably improve the transfer efficiency, and hence it attacked great attention. However, there are few studies on offset characteristics in HTS WPT systems. In order to further improve the performance of HTS WPT systems, we have studied experimentally the influences

The modified phenomenological Ginzburg-Landau (MPGL) theory used to observe the anisotropy of the penetration depth as well as the Sommerfeld coefficient in the pnictide superconductor of the composition Ba0.6K0.4Fe2As2. The values of such thermodynamic parameters have been theoretically calculated and presented in this context. The qualitative, as well as quantitative results of such anisotropies

One-dimensional hybrid photonic quasicrystals made of superconductor (HgBa2Ca2Cu3O8+δ) and Dielectric (Si) materials are theoretically investigated by the Gorter Casimir two fluid model (GCTFM) and the transfer matrix method (TMM). The proposed quasicrystals super-lattices are built according the ternary configuration GF/GTM/GF. Where, GF and GTM are the generalized Fibonacci and Thue-Morse sequences

Ex situ processed tapes using ball milled MgB2 powders with Sn addition were sintered at various temperatures. Sn addition causes the formation of some amorphous or poor crystalline phase in the as-milled powders and reduces the optimal sintering temperature (Tsin), at which best performance in transport critical current density (Jc) at 4.2 K in 10 T is obtained for the tapes, to about 600 °C. This

Using the first principle calculations, electronic structure and magnetic properties of Ba(Fe1-xCox)2As2 (x = 0, 0.125) are studied. The collinear antiferromagnetic order is the ground states of the parent compound BaFe2As2. Only hole pockets appear near points Γ and Z for BaFe2As2, while there are both hole and electron pockets nesting near the Γ and Z for Ba(Fe0.875Co0.125)2As2 due to the up shifting

Proper characterisation of investigated samples is vital when studying superconductivity as impurities and doping inhomogeneities can affect the physical properties of the measured system. We present a method where a polarised neutron imaging setup utilises the precession of spin-polarised neutrons in the presence of a trapped field in the superconducting sample to spatially map out the critical temperature

Quench detection is very greatly significant for the safe operation of high temperature superconducting (HTS) cables. Raman-scattering based optical fiber sensing technology can be used to monitor the temperature along power cable because of the advantages of anti-electromagnetic interference, thin structure, and convenient fixing, etc. In this work, the feasibility of insulation-packaged optical fiber

Cuprate superconductors have a layered structure, and then the physical properties are significantly enriched when two or more two copper-oxide layers are contained in a unit cell. Here the characteristic features of the renormalization of the electrons in the bilayer cuprate superconductors are investigated within the framework of the kinetic-energy driven superconducting mechanism. It is shown that

BaMO3 (BMO, M=Zr, Sn, Hf, etc.) is well known to undergo self-organisation into many nanorods in a REBCO film grown by vapour phase epitaxy. However, REBCO experiences strain resulting from the BMO nanorods and this strain causes the superconducting properties to deteriorate. In this study, we prepared SmBCO films containing 16 vol% BaHfO3 (BHO) using a pulsed laser deposition method. Deposition was

We present here calculations on electronic spectra of a system consisting of a quantum dot connected to superconducting leads on its either side. In these calculations the generated spectra has contributions from both, the single particle tunneling, and from the tunneling Cooper pair of electrons. In this, the Anderson model is used for the theoretical construct, and hence, the single particle tunneling

This paper is focused on the turn-to-turn contact resistance as a major source of the characteristic resistance of no-insulation YBCO pancake coil. Usually, the characteristic resistance of the coil is calculated by measuring decay time constant. However, we identify that the turn-to-turn contact resistance is not a constant value and changes with time. In order to verify this, one single pancake NI

The hybrid trapped field magnet lens (HTFML), proposed by the authors in 2018, is a promising device that is able to concentrate a magnetic field higher than the applied field continuously, even after removing the external applied field. In this study, we have investigated the optimized performance of the HTFML consisting of a GdBaCuO magnetic lens and a hollow, cylindrical EuBaCuO trapped field magnet

A 3.0 T MRI magnet using MgB2 superconductors with conduction cooling for dedicated mice imaging was designed. The magnet configuration is determined by the central magnetic field strength, maximum magnetic field, magnetic field uniformity, uniformity volume, stray field, and coil costs. Linear programming was used to optimize the superconducting magnet of the MRI system. The optimized superconducting

We used the superconductors in the SuperCon database to construct element vectors and then perform machine learning of their critical temperatures (Tc). Only the chemical composition of superconductors was used in this procedure. No physical predictors (neither experimental nor computational) of any kind were used. We achieved the coefficient of determination R2 ≃ 0.93, which is comparable and in some

To promote the adaptability of the practical Magnetocardiography (MCG) system working in unshielded environment, the SQUID readout electronics is required to improve its stability and the Electromagnetic Compatibility (EMC). It should be low-drift to the variation of cryogenic liquid level in long-time running, avoid Electromagnetic Interference (EMI) internally from the control circuit, be electrical

We deal with the nanoscale superconductivity. Vortex configurations of superconducting 3D nano disk and square placed on the top of a dipole are studied by phenomenological Ginzburg-Landau (GL) formalism. Gibbs free energy is observed to identify the stability range of different vortex state. Effect of the confinement to the vortex flow is investigated by time dependent GL equation. Amount of flux

The inner superconducting coil of the China Fusion Engineering Test Reactor (CFETR) central solenoid model coil (CSMC) is made of Nb3Sn conductor of the Cable-in-Conduit Conductor (CICC) structure. After winding the model coil into shape, it is heat-treated by gas protection. The flow resistance of shielding gas in the coil is studied by means of theoretical calculation and experiment. The pressure

Joule heating is a non-equilibrium dissipative process that occurs in a normal metal when an electric current flows, in an amount proportional to the metal’s resistance. When it is induced by eddy currents resulting from a change in magnetic flux, it is also proportional to the rate at which the magnetic flux changes. Here we show that in the phase transformation between normal and superconducting

In this paper, a one-way multichannel and wide-angle absorber based on the one-dimensional superconductor photonic crystals (SPCs) in the terahertz regime is realized via splicing the classical quasi-period sequences and manipulating the ambient temperature properly, whose characteristics and mechanisms are theoretically investigated by the transfer matrix method. The preeminent absorbing features

Due to the external disturbances or the time-variable load, it is necessary to study the dynamic levitation behavior in order to guarantee the stable levitation of superconducting magnetic bearing (SMB). This paper investigates the dynamic levitation behaviors of a radial-type SMB under axial load condition. By adopting the Power-law E-J relation, the simplified H-formulation finite element model of

In this paper, a three-dimensional semi-analytical approach, based on the volume integral method, is developed to compute the forces and torque in fully high temperature superconducting (HTS) ironless axial flux machine (IAFM). The use of particular volumetric basis elements helps to speed up the computation of the magnetic field. The Maxwell stress tensor method is used for the force and torque calculations

In this paper, we study the vortex dynamics of the open superconducting square tubes in the presence of external magnetic field by the time-dependent Ginzburg-Landau (TDGL) equations coupling with heat dissipation equation. The influences of geometry and the environment temperature are considered. It is found that the size and location of the hole have a significant effect on the vortex dynamics and

We report the magnetic properties of BaFePtAs2 compound in a wide temperature range of 5-300 K in the field up to 9 Tesla. The first syntheses of this compound were obtained by conventional solid state reaction technique. The compound crystallizes in the ThCr2Si2-type structure with the space group of I4/mmm. This compound exhibits a superconducting phase transition at around 20 K in low field magnetization

In this study, the authors carried out an inspection of the extent of fabrication defects in rare-earth barium copper oxide (REBCO) coated conductors (CC) using the displacement-energy model (DEM) approach. The DEM approach can simulate the creation, propagation, and distribution of interfacial defects during the deposition of films onto a substrate, thereby save researchers the enormous resources

Defects are frequently introduced during the fabrication process of long-length coated conductors and typically have a critical current (Ic) that is lower than the average Ic of the conductor. If the Ic of a defective area can be increased to a value similar to the average conductor Ic, the applicability of long-length high-Tc superconducting (HTS) tape with defects can be improved. We have proposed

An array of nanoelectromechanical beams driven by an electrical line of Josephson junctions equivalent models is studied. It is found that a single electromechanical system displays oscillations under a critical value of the DC bias current. In the case of an array of electromechanical system constituted of a series of coupled discrete Josephson junction with a beam place at each node, the numerical

Theoretical investigation of the elastic, electronic, superconducting, and thermal properties of newly synthesized cubic perovskite superconductor (Ba0.54K0.46)4Bi4O12 (BKBO) is carried out by generalized gradient approximation (GGA) which is based on density functional theory (DFT). Comparisons are made with two recently discovered Bi-basedAA'3B4O12-typeperovskite superconductors (Na0.25K0.45)Ba3Bi4O12

We theoretically study the escape rate of S → R switching (from superconducting S state to resistive R state) in Josephson junction (JJ) formed by s-wave single-band (SB) and two-band (TB) superconductors (SB/TB junctions). The escape rate is calculated in terms of effective critical current in thermal activation (TA) and macroscopic quantum tunneling (MQT) regimes. It was shown that escape rate can

This paper presents a novel approach in two-area interconnected power system for enriching the transient stability at perturbations. The challenging task in the interconnected system is to equalize the power production and load demand without changing the system parameters. Therefore, a sophisticated controller of flexible alternating current transmission system (FACTS) called distributed power flow

Using Blonder-Tinkham-Klapwijk (BTK) formalism we studied the transport properties in silicene-based normal/ferromagnetic p-wave superconductor (N/FpS) junctions. Our study shows that the amplitude of the normalized conductance strongly depends on the pairing symmetry in superconductor such as px, py and px+ipy-wave symmetries, the applied electric field (EZ) and the exchange field (h) in FpS. In N/FpxS-silicene

The nontoxic cuprate superconductor (Cu,C)Ba2Ca3Cu4Oy [(Cu,C)-1234] with critical temperature of about 117 K is supposed to have great potential for applications in the liquid nitrogen temperature region. Using pulsed laser deposition technique, we successfully obtain superconducting (Cu,C)-1234 films on LaAlO3 (001) substrates with different critical temperatures by tuning the flow rate of CO2 gas

Evolution of the excess conductivity in YBCO single crystals is investigated after their step-by-step irradiation with fast electrons. The dependence of the coherence length ξc(0) along the c-axis on the irradiation dose dependence is obtained. It is revealed that an increase of the irradiation dose from 1.4 to 8.8 × 1018 cm−2 leads to a considerable extension of the temperature range of the excess

Magnesium boride, MgB2, has attracted much attention since the discovery of its superconductivity in 2001. The absence of weak-links in grain boundaries, less prominent anisotropy, rather simple powder-in-tube wire fabrication techniques, and much lower prices of raw materials, have made this new superconducting material a promising candidate for high-field magnet applications. Furthermore, it has

According to growing demand for high power electric machines, HTS coils which are able to transport high current have been widely researched. For application of HTS coils to electric devices stable operation should be verified so that protection schemes of HTS coils have been investigated by many researchers. Among the many insulation methods for protection, the Quasi-Insulation (QI) winding scheme

The bulk superconducting properties of polycrystalline TaRh2B2 under pressure are investigated with transport resistivity [ρ(T)], and dc magnetization [M(T) and M(H)] measurements up to ~3 GPa, and 1 GPa respectively. The application of hydrostatic pressure leads to a decrease in Tc for both magnetic [dTc/dP is −0.4 K/GPa (0 ≤ P ≤ 1 GPa)] and transport [(dTc/dP) is −0.02 K/GPa (0 ≤ P ≤ 1 GPa) and −0