Anomalous transition temperature oscillations in LOFF state

TL;DR

This paper investigates how magnetic flux influences the transition temperature and oscillation patterns in the LOFF superconducting state, revealing unique effects like flux-induced T_c increase and double-peak AB oscillations.

Contribution

It introduces a detailed analysis of the Aharonov-Bohm effect in inhomogeneous LOFF states, including calculations of heat capacity and persistent current, and discusses fluctuation interactions near T_c.

Findings

Magnetic flux can increase the transition temperature in LOFF states.

AB oscillations can exhibit a double-peak structure within one period.

Expressions for heat capacity and persistent current in thin rings and cylinders are derived.

Abstract

We consider Aharonov - Bohm effect at normal metal-inhomogeneous LOFF superconducting state transition. It is shown that magnetic flux can increase the transition temperature and AB oscillations can have the double-peak structure at one period. Expressions for fuctuational heat capacity and persistent current are calculated for a thin ring and a cylinder. We also discuss the effect of fluctuations interaction in the nonuniform states in the vicinity of the superconducting transition.