The superconducting instability in a non-Fermi liquid in d > 1 is considered. For a particular form of the single particle spectral function with homogeneous scaling A(Λk,Λω) = ΛA(k, ω) it is shown that the pair susceptibility is also a scaling function of temperature with power defined by α. We find three different regimes depending on the scaling constant. The BCS result is recovered for α = ...

We report the discovery of a low-temperature phase transition in Bi2Sr2Ca(NixCu1−x)208 high temperature superconductor. This transition manifests itself as a sharp reduction of the thermal conductivity of the samples at a temperature T∗c ≈ 200 mK. The temperature dependence of the thermal conductivity changes dramatically from T with α between 1.6 and 1.75 above the transition to T-linear behav...

In recent experiments with a superconducting nanosized Pb bridge formed between a scanning tunneling microscope tip and a substrate, superconductivity has been detected at magnetic fields, which are few times larger than the third (surface) critical field. We describe the observed phenomenon on the basis of a numerical solution of the Ginzburg-Landau equations in a model structure consisting of...

We demonstrate theoretically all-electric control of the superconducting transition temperature using a device comprised of a conventional superconductor, a ferromagnetic insulator, and semiconducting layers with intrinsic spin-orbit coupling. By using analytical calculations and numerical simulations, we show that the transition temperature of such a device can be controlled by electric gating...

We have synthesized the polycrystalline samples of Eu1-xKxFe2As2 (x = 0-1) and carried out systematic characterization using x-ray diffraction, ac & dc magnetic susceptibility, and electrical resistivity measurements. We have seen a clear signature of the coexistence of superconducting transition (Tc = 5.5 K) with SDW ordering in our under doped sample viz. x = 0.15. The spin density wave trans...

Magnetization measurements on Y0.47Pr0.53Ba2Cu3O7 single crystal in the vicinity of the superconducting transition temperature Tc = 7 K revealed a reentrant irreversibility for applied magnetic fields higher than the irreversibility field Hirr. The transition to the second hysteresis loop occurs through an irreversible jump in magnetization. The temperature range of this irreversibility extends...

A proximity-effect thermometer measures the temperature dependent critical supercurrent in a long superconductor normal metal superconductor (SNS) Josephson junction. Typically, the transition from the superconducting to the normal state is detected by monitoring the appearance of a voltage across the junction. We describe a new approach to detect the transition based on the temperature increas...

We study the behaviour of the electronic chemical potential in YBa2Cu3O6+δ near the superconducting transition using the spin-wave exchange theory of pairing. We find that the experimental value of the jump in the temperature derivative of the chemical potential is inconsistent with the theoretical value calculated under the assumption of constant hole concentration. It is suggested that charge...