Fulde-Ferrell-Larkin-Ovchinnikov-like state in Ferromagnet-Superconductor Proximity System

TL;DR

This paper explores the properties of a ferromagnet-superconductor proximity system, highlighting the emergence of an FFLO-like state with unique thermodynamic and transport features, including oscillatory behaviors and spontaneous spin currents.

Contribution

It introduces the concept of an FFLO-like state in ferromagnet-superconductor systems and discusses its unusual properties and potential experimental observations.

Findings

Oscillatory behavior of pairing amplitude and density of states

Spontaneous spin polarized current in the ground state

Potential experimental signatures of the FFLO-like state

Abstract

We discuss some properties of the ferromagnet-superconductor proximity system. In particular, the emphasis is put on the physics of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) like state. In addition to Andreev reflections it features a number of unusual thermodynamic and transport properties, like: oscillatory behavior of the pairing amplitude, density of states and superconducting transition temperature as a function of the ferromagnet thickness. Surprisingly, under certain conditions spontaneous spin polarized current is generated in the ground state of such a system. We provide some informations regarding experimental observations of this exotic state.