2014 The analysis of possible phenomena in the superconductor-constriction-superconductor (S-c-S) junctions inserted into microwave circuits is carried out. The results of experiments in which properties of the junctions making them different in comparison with usual nonlinear microwave elements were studied are discussed. The characteristics of receiving devices such as amplifiers, detectors a...

Recent resonant inelastic x-ray scattering (RIXS) experiments have detected a significant high-energy spin-excitation anisotropy in the nematic phase of enigmatic iron-based superconductor FeSe, whose origin remains controversial. We apply an itinerant model previously used to describe as measured by neutron measurements, with magnetic fluctuations included within RPA approximation. The calcula...

Reentrant superconductivity has been observed in the candidate spin-triplet superconductor UTe$_2$ as a function of magnetic field applied along hard axis. Resistivity measurements have shown, broadened superconducting transition appears near minimal $T_c$, highlighting importance fluctuations this regime. We present phenomenological study assuming field-driven first-order between two states. s...

Three-dimensional van der Waals ferromagnet Fe 3 GeTe 2 (FGT) is regarded as a candidate for the magnetic topological nodal line semimetal. We investigate lateral electron transport between two ?m spaced superconducting In leads beneath thick three-dimensional FGT exfoliated flake. At low temperature of 30 mK, we observe Josephson supercurrent that exhibits unusual critical current I c suppress...

We review and analyze magnetization and specific heat investigations on type-II superconductors which uncover remarkable evidence for the magnetic field induced finite size effect and the associated 3D to 1D crossover which enhances thermal fluctuations. Indeed, the correlation length transverse to the magnetic field Hi, applied along the i-axis, cannot grow beyond the limiting magnetic length ...

We use a number of large-N limits to explore the competition between ground states of square lattice doped antiferromagnets which break electromagnetic U(1), time-reversal, or square lattice space group symmetries. Among the states we find are d-, (s∗+id)-, and (dx2−y2+idxy)-wave superconductors, Wigner crystals, Wigner crystals of hole pairs, orbital antiferromagnets (or staggered-flux states)...