Systematic Raman spectroscopic study was conducted on the wurtzite (002) Sb-doped ZnO films grown by pulsed laser deposition with different Sb doping levels and annealed at different temperatures, with the undoped, Cu-doped and Ga-doped ZnO films for comparison. Three additional Raman modes 235 cm−1, 510 cm−1 and 534 cm−1 were observed only in the Sb-doped ZnO samples but not in the other controls

Thermal motion of the surface atoms will lead to a decrease in photoemission intensity, while surface segregation may result in an increase of some phostoemission intensities. For In4Se3(001), both effects are seen. The Debye–Waller factor plot, based on the temperature dependent X-ray photoemission spectroscopy (XPS) measurements on In4Se3(001), suggests an upper bound of 203 ± 6 K for the effective

A novel method is presented for the production of the in-situ MgB2/Fe mono-core internal magnesium diffusion (IMD) processed wires by using Mg powder instead of Mg rod to accomplish internal diffusion of magnesium into semi-crystalline boron powder. The MgB2/Fe wires were cold drawn to 0.81 mm diameter. The structural investigation of superconducting MgB2 layers was completed using X-ray diffraction

We measured the spin rectification effect and the inverse spin Hall effect in Nb-doped SrTiO3 by pumping the spins from the ferromagnetic thin films into SrTiO3. The spin injection is increased when the doping level is increased. However, the spin to charge conversion efficiency which is measured by the spin Hall angle decreases when Nb concentration is more than ∼0.02 wt%. We argued that it is because

The crystal and electronic structures of Ti–doped D022 type NbAl3 are evaluated by first–principles method. The Ti–doped effects on their mechanical and optical properties are analyzed according to the electronic structures calculation, specifically, while the Ti–doped atomic percentages are 3.13 at%, 6.25 at%, and 9.38 at% as well as 12.50 at%. The results suggested that the bulk modulus, shear modulus

Thermodynamic quantities such as internal energy, heat capacity, and entropy are calculated for doped quantum dot by taking into account the Rashba spin-orbit coupling. It is demonstrated that thermal properties can be controlled by Rashba coupling, Gaussian impurity parameters, and applied fields so that enhancement of Rashba coupling strength and electric field reduces the internal energy. The changes

We report the thermoelectric properties of flexible Bi2Se3-Polyvinylidene fluoride (PVDF) based polymer nanocomposites (PNC) over a temperature range from 250 K to 350 K. The two-dimensional Bi2Se3with nanoplate like structure is synthesized using the reflux method and is dispersed with the PVDF matrix. A significant reduction in the thermal conductivity of the PNC in comparison to the individual phases

HfTiZrSc is a novel hexagonal close-packed refractory high entropy alloys, addition of Al as typical additives significantly enhances the strength and ductility. To reveal the effect of Al addition on thermal properties, we combine the EMTO-CPA ab initio calculations with quasi-harmonic Debye-Grüneisen model to studied the thermodynamic properties of the Hf0.25Ti0.25Zr0.25Sc0.25-xAlx (x ≤ 15 at.%)

In this work, n type Cu5In9Se16 was prepared using the vertical Bridgman–Stockbarger technique. N type conductivity is confirmed by the Hall effect method and also by the standard test Method for conductivity type of extrinsic semiconducting materials. Our samples are crystallized in a tetragonal phase with a P4mm space group. The optical absorption coefficient has been studied and the value of the

The linear thermal expansion coefficients in the intermediate valence system Ce2Ni3Si5 were determined along the main crystallographic directions by means of neutron diffraction in the temperature range 10–300 K. The anomalous contribution to thermal expansion due to valence instabilities of cerium was estimated by employing the virtual mix approach. The magnitude of the anomalous magnetic contribution

High reflection and dust are an unwanted loss process in the applications of solar panels. However, using antireflective hydrophobic solar panels improves their photovoltaic efficiency and reveals to self-cleaning, time-consuming and cost-effective results. The design, synthesis, modification, and characterization of the nano hydrophobic and antireflective films of solar modules are reported. Simple

We study the magneto-optical properties of a Pöschl–Teller-like quantum well made of different materials such as GaAs, GaSb, InAs, and InSb. The energy difference becomes smaller with the wider well-width and becomes bigger with the deeper well-depth. The energy difference appears smallest in GaAs, followed by that in GaSb, while InSb shows the largest. The magneto-optical absorption coefficient (MOAC)

In this report the pursuance of Fe concentration on the structural, microstructural, optical, transport and magnetic properties of Indium Oxide (In2O3) have been systematically investigated. Rietveld refined X-ray diffraction, high resolution transmittance electron microscope (HRTEM), selected area electron diffraction (SAED) and Raman patterns substantiated the pure single phase of In2−xFexO3 (x =

A semi-empirical method to define a partition function for phonons is proposed, which is capable of accurately reproducing thermodynamic functions, especially in the intermediate temperature range, where the Debye theory occasionally fails to describe the emerging phonon peaks in the heat capacity. The phonon partition function is defined with a temperature-dependent spectral cutoff Λ(T) and Debye

Magnetic, superconducting, and quantum oscillation phenomena in crystallite structures with nano-width multilayer interfaces of three-dimensional topological insulator Bi1-xSbx (0.07 ≤ x ≤ 0.2) have been studied. Samples with a high degree of imperfection have been prepared by the modified horizontal zone recrystallization method using the double seed technique. It has been found that the Dirac charge

We studied the effect of nitridation condition of Mo foil on the properties of GaN nanorods grown by laser molecular beam epitaxy. It is found that randomly size-distributed three-dimensional GaN islands were grown on bare Mo foil at growth temperature of 700 °C. Upon nitridation of Mo foil with low nitrogen plasma flux, hexagonally-faceted inverse-tapered GaN nanorods were grown whereas tapered GaN

In this work, Ag/MoS2 composite thin films were fabricated. The effects of MoS2 layer on the structure and optical properties of Ag thin film were investigated. XRD results show that MoS2 buffer layer has the effects of promoting grain growth of Ag and increasing their particle sizes confirmed by SEM images. The surface plasmon resonance (SPR) wavelength of Ag was observed to shift from 432 nm to 1650 nm

The so-called quantum metric tensor is a band-structure invariant whose measure corresponds to the quantum distance between nearby states in the Hilbert space, characterizing the geometry of the underlying quantum states. In the context of spin–orbit coupled Fermi gases, we recently proposed that the quantum metric has a partial control over all those superfluid properties that depend explicitly on

Zinc (Zn) and tin (Sn) based alloy thin films have been of recent interest in the semiconductor industry. Despite such interest, knowledge on how the concentration of Sn affects the chemical, electrical, optical and surface properties SnZn thin films is still scarce. In this paper, SnZn thin films with varying ratios of Zn to Sn were fabricated through radio frequency (rf) magnetron sputtering. The

The first-principles study of platinum group metals (Pt, Pd, Rh, Ir, Os, Ru) and their intermetallic alloys PtRhX (X = Pd, Ir, Os and Ru) are presented. Total energy was calculated with two different correlation functionals i.e. the local density approximation (LDA) and the generalized gradient approximation (GGA). The ground state quantities such as bulk modulus and lattice parameter have been evaluated

We used two computational approaches to study hybrid perovskites tin-based photovoltaic solar cells. The first approach is based on electronic transport properties with density functional theory in combination to non-equilibrium Green's function formalism. We have investigated the transmission spectra and density of states. It was observed that the transmission gap decreases when it moves from MASnI3

We present broadband solar absorber using gold metasurface resonators. The gold metasurface resonators are placed above MgF2 substrate and tungsten ground plane. MgF2 substrate is widely used substrate in solar absorber for achieving higher absorption. The ground plane made of tungsten material reduces the overall cost of the structure. The results are presented in the form of reflectance, transmittance

Chromium doped lanthanum-gallium ferrites have been prepared using solid-state reaction method. Electrical conductivity, impedance and dielectric properties of La0.7Ga0.3Fe1-xCrxO3 have been investigated using impedance spectroscopy technique. Electrical analysis shows that ac-conductivity obeys to the Jonscher power law. DC-conductivity analysis shows that introducing chromium in La0.7Ga0.3Fe1-xCrxO3

The novel semi-organic single crystals of l-histidine l-aspartate monohydrate (LHLAM) are grown by the solvent evaporating method. The grown LHLAM crystal systems have been analyzed by XRD and it shows that the monoclinic system with corresponding lattice parameter is identified. From the FTIR and FTRAMAN analyses shows the existence of a variety of characteristic functional groups are present in LHLAM

This work focused on the effect of dipolar interactions between particles on the magnetic heating efficiency of nanoferrites under an alternating magnetic field. The low-temperature hydrothermal method was adopted to obtain nanoparticles composed of Co0.3Zn0.7Fe2O4 and Co0.5Zn0.5Fe2O4. The single-phase spinel structure of the samples was confirmed from X-ray diffraction data via Rietveld refinement

The temperature dependence of resistance (1.5–300 K) of electrochemically deposited vertically align Platinum nanowires (Pt-NWs) is characterized by using the Bloch-Grüneisen formalism (BG), Fuchs-Sondheimer theory (FS), Mayadas-Shatzkes model (MS) and Debye temperature (θR). The low value of θR ∼34 K in Pt-NWs as compared to bulk Pt (θR ∼ 242 K) shows significant phonon softening associated with the

We theoretically investigate a family of spin-frustrated triangular molecular nanomagnets with arbitrary on-site spin, featuring one heterometallic ion, in the limit of zero spin-orbit coupling. Analytical evaluation of the Heisenberg exchange states and spectrum shows that the ground state can either be the first example of a toroidal quartet, or feature two weakly split toroidal doublets, depending

In this paper, we use a theoretical model in order to describe a quantum dot-cavity system at finite temperature. In addition, a tilted magnetic field is included which generates two bright exciton states with definite polarization that can be tuned by the Zeeman and diamagnetic shift. Strong coupling between the cavity and two bright states is observed when the magnetic field varies in strength and

We investigated the field dependences of magnetization M(H), the temperature dependences of magnetic susceptibility χ(T), and specific heat C(T) of orthorhombic ErFe2Al10 and ErRu2Al10 single crystals in a temperature range of 0.46–300 K. For ErFe2Al10, an antiferromagnetic phase transition was observed at the Néel temperature TN 1.7 K, and M(H) of the b-axis at 0.47 K indicated a metamagnetic transition

Optical properties of amorphous oxide/metal/amorphous oxide (OMO) multilayers have been investigated in visible-infrared (Vis-IR) region depending on the change of carrier concentration. Free carrier density was considered to be one of the most dominant parameter to affect both the optical and electrical properties of OMO multilayers. Free carrier density distribution in OMO multilayer was analyzed

We use classical molecular dynamics (MD) simulations to investigate the mechanical properties of pre-cracked, nano-porous single layer MoS2 (SLMoS2) and the effect of interactions between cracks and pores. We found that the failure of pre-cracked and nano-porous SLMoS2 is dominated by brittle type fracture. Bonds in armchair direction show a stronger resistance to crack propagation compared to the

Mn-based Heusler alloys ‘MnY2Z (Z= (Al and Si)) have ‘L21’ crystal structure at the ambient condition of temperature and pressure. MnY2Z have a high melting temperature, shows half-metallic character and shape memory effects where numerous of its applications takes place. In this report, theoretical investigations of the phonon properties of MnY2Z in the cubic phase has been investigated by using density

The mechanical and electronic characters of the second phases and solid solutions in Ti-xAl-yV (x = 5.0–7.0 wt %; y = 3.5–6.0 wt %) alloys were investigated in detail via first-principles calculations based on density functional theory (DFT). Firstly, the contents of α(AlTi3) and β(Ti–V) phase in goal alloys were calculated. Furthermore, their structural and elastic properties were calculated. Besides

Recently a noteworthy development in the thermoelectric performance of skutterudites has been achieved by implementing void fillers in the caged structures. In present work, we employ a systematic study on the effect of Sr-filled SrRu4As12 on its thermoelectric properties based on first principles calculations. SrRu4As12 crystallizes in ferromagnetic phase having the brittle nature. On application

Hydroxyapatite (HA) is a compound that is analogous to the natural human bone mineral. This aspect of hydroxyapatite entitles it as a bioceramic bone implant material. Since hydroxyapatite needs to be biocompatible and strong to withstand the body, it is imperative to study its mechanical properties as well. With an interest to understand the hardness behaviour of hydroxyapatite from a different perspective

We have investigated the effect of synthesis method on critical behavior and magnetic entropy change of La0.7Ba0.1Ca0.1Sr0.1MnO3. The samples were prepared using the wet-mixing (WM) and sol-gel (SG) methods. The Curie temperature (TC) was approximately 316 and 330 K for the WM and SG samples, respectively. The estimated critical exponents (β, γ, and δ) were close to the mean-field theory for the WM

Fabrication and characterization of metal/semiconductor/polymer/metal (MSP) heterojunction diode are reported. The Al/p-Si/P3HT/Ag MSP heterojunction have been manufactured by a homemade ultrasonic spray pyrolysis (USP) method, and the organic layer has a thickness of ∽150 nm and silver as front contact is deposited by physical vapor deposition (PVD) technique. The organic layer is deposited on glass

Half-metallic (HM) ferromagnets provide an excellent possibility to design spintronic applications, yet a limited number of ferromagnetic materials are available which provide half-metallicity only in one spin channel. Moreover, often theoretically explored HM gap disappears when the material is synthesized experimentally due to small lattice mismatch happens which further hinders the advancement of

Relationship between variation of Bi and O valence states in perovskite bismuthates Ba1-xKxBiO3 (BKBO), grown in modified synthesis conditions, and their superconducting state properties is presented. Chemical composition, crystal structure and phase purity of BKBO was determined via micro X-ray fluorescence (μXRF), energy-dispersive X-ray spectroscopy (EDS) and X-ray powder diffraction technique (XRD)

In this paper, we present and discuss the results of first-principles calculations of the structural, electronic, optical, elastic and thermodynamic properties of the monoclinic quaternary nitride Ba3Ca2Si2N6. A comparison between the computed crystal structure parameters and the corresponding experimental counterparts shows a very good agreement between them. The elastic constants were evaluated numerically

We propose a compound structure with three triangular sublattices to achieve arbitrary accidental degeneracies of band crossing in their phononic and photonic band structures. Dirac-like points are tuned by a method of valley engineering folding high symmetric K points belong to different valleys to the Γ point of the Brillouin zone center. The degeneracy orders are varied from four-fold to triple-fold

A Kinetic Monte Carlo (KMC) simulation regarding the growth mechanism of oblique angle deposited Be film using magnetron sputtering was performed. We have analyzed the columnar nanostructure, layer density and porosity of generated film under the effect of incident angle and working pressure. Our results suggest that the incident angle of 60° is a demarcation point for the film morphology—the particle

Glass nanocomposite (GNCs) samples in the composition [(90-x) Li2B4O7- xBaTiO3- 10Nb2O5] with x = 5, 7.5, 10, 12.5 and 15 (in mol%) were prepared. Rietveld refinement of the data for the reagent grade of the BaTiO3 revealed that the structure is a tetragonal phase (space group P4mm). The energy dispersive X-Ray (EDX) spectra and scanning electron microscopic (SEM) micrographs exhibit the two phases

The electronic structure and magnetism of pristine magnesium oxide (MgO) (001) surface have been studied using first principle calculations based on density functional theory (DFT). Our results reveal that isolated magnesium (Mg) vacancy (VMg) can produce a magnetic moment of about 1.99 μB. The magnetic moment mainly comes from p-orbitals of oxygen atoms adjacent to VMg. The surface with one VMg will

A new stable solid di[1-(2-ethoxyethyl)-5-nitrobenzimidazole] cobalt dichloride (2) and di[1-(2-ethoxyethyl)-5-nitrobenzimidazole] copper dichloride (3) were prepared by the combination of 1-(2-ethoxyethyl)-5-nitrobenzimidazole (1) with metal salts (CoCl2.6H2O and CuCl2.H2O). Synthesized di[1-(2-ethoxyethyl)-5-nitrobenzimidazole] cobalt dichloride (2) and di[1-(2-ethoxyethyl)-5-nitrobenzimidazole]

Dy3+ doped Sr2MgSi2O7 (0–11 mol%) nanopowders were prepared by low-temperature solution combustion technique which is based on the propellant chemistry concepts. Powder X-ray diffraction study confirms the crystalline nature with a crystallite size of about 30 nm and single-phase formation with space group P4̅21m. The optical band gap and refractive indices were estimated by diffused reflectance spectroscopy

In this work, the effects of tin doped indium oxide (ITO) thin films with different thicknesses (50 nm–476 nm) on the optoelectronic performance were investigated. Meanwhile, the sputtered ITO layers were annealed at 180 °C for 60min under air atmosphere. The result indicated that the electro-optical properties of ITO films with the thickness (383 nm) were optimum, and the corresponding resistivity

We studied the electronic structures of (001), (110), and (111) LaNiO3 (LNO) films using XPS. Core-level photoemission spectra analysis reveals that the energy separation ΔE from the satellite to main peaks of Ni 2p1/2 clearly varies in accordance with LNO film orientation. The ΔE in (111) LNO films is 9.71 ± 0.1 eV, larger than the values of 9.39 ± 0.1 and 9.21 ± 0.1 eV in corresponding (001) and

In a recent paper [Physica B 552 (2019) 62–70] Assiri et al. studied the optical properties of the spin-coated nanostructured methyl violet-10B (MV-10B) thin films. The refractive index and extinction coefficient of samples were calculated based on the reflectance and phase angle between the incident and reflected signals for a particular wavenumber. It is shown in this comment that they have used

Free-volume type defects, such as vacancies, vacancy-agglomerates, dislocations, and grain boundaries represent a key parameter in the properties of ultrafine-grained and nanocrystalline materials. Such free-volume type defects are introduced in high excess concentration during the processes of structural refinement by severe plastic deformation. The direct method of time-differential dilatometry is

We report on new developments in the quantum picture of correlated electron transport in charge and spin density waves. The model treats the condensate as a quantum fluid in which charge soliton domain wall pairs nucleate above a Coulomb blockade threshold field. We employ a time-correlated soliton tunneling model, analogous to the theory of time-correlated single electron tunneling, to interpret the

The structural, electronic and vibrational properties of InN under pressures up to 20 GPa have been investigated using the pseudo-potential plane wave method (PP-PW). The generalized-gradient approximation (GGA) in the frame of density functional theory (DFT) approach has been adopted. It is found that the transition from wurtzite (B4) to rocksalt (B1) phase occurs at a pressure of approximately 12

Entanglement between degrees of freedom, namely between the spin, path and (total) energy degrees of freedom, for single neutrons is exploited. We implemented a triply entangled Greenberger-Horne-Zeilinger(GHZ)-like state and coherently manipulated relative phases of two-level quantum subsystems. An inequality derived by Mermin was applied to analyze the generated GHZ-like state: we determined the