We study the transition temperature Tc(H) of a quasi-one-dimensional (Q1D) superconductivity which is derived from the quantum effect of an electron motion in a strong magnetic field. We calculate Tc(H) of both isotropic and anisotropic superconductivity by taking account of the optimal momentum of the Cooper pairs and the effect of higher harmonic terms along second conducting axis in the tigh...

Transport properties of tetragonal iron monosulfide, mackinawite, show a range of complex features. Semiconductive behavior and proximity to metallic states with nodal superconductivity mark this d-band system as unconventional quantum material. Here, we use the density functional dynamical mean-field theory (DFDMFT) scheme to comprehensively explain why tetragonal FeS shows both semiconducting...

The effect of magnetic field on specific heat of a p-wave spin triplet superconductor has been analyzed. To describe superconductivity we used a single band model with various realizations of p-wave order parameter and analyzed the effect of a Doppler shift in different temperatures.

Using microfabricated break junctions, we have produced Al and Au contacts consisting of a small number of atoms. These metallic quantum point contacts accomodate a small number of conduction channels. We have determined the individual transmission coefficients in contacts containing up to six conduction channels. The determination is based on a comparison of the highly nonlinear current–voltag...

Low dimensionality, broken symmetry and easily-modulated carrier concentrations provoke novel electronic phase emergence at oxide interfaces. However, the spatial extent of such reconstructions - i.e. the interfacial "depth" - remains unclear. Examining LaAlO₃/SrTiO₃ heterostructures at previously unexplored carrier densities n(2D) ≥ 6.9 × 10(14) cm(-2), we observe a Shubnikov-de Haas effect fo...

The relationship among unconventional superconductivity, antiferromagnetism, and nematic order in iron-based superconductors (FeSCs) is still highly debated. In many FeSCs superconductivity proximity of a nematically magnetically ordered state. LiFeAs an exceptional stoichiometric FeSC becoming superconducting below 18 K without undergoing structural or magnetic transition. However, some recent...

We present an unexpectedly strong influence of the proximity effect between bulk Ru(0001) superconductor and atomically thin layers Co on crystal structure latter. The monolayer grows in two different modifications, such as hcp stacking a reconstructed ε-like phase. While islands show weak little suppression superconductivity substrate next to it, more complex becomes almost fully superconducti...

Josephson proximity junctions and devices employing topological insulators are promising candidates for realizing superconductivity topologically protected quantum circuits. Here, the new type of oscillations critical current in ballistic Nb-Bi2Te2.3Se0.7-Nb subject to magnetic fields is reported. The appear below ≈400 mK have a very unusual sharp-peaked shape. Their ultra-short period ≈1 Oe, b...

We examine the effects of the CuO chains on the density of states in the vortex phase in YBa2Cu3O7, via a calculation based on the tight-binding proximity model. In this model, chain superconductivity results from single-electron hopping between the intrinsically-normal chains and intrinsically-superconducting CuO2 planes. The calculations are based on self-consistent solutions of the Bogolyubo...