# Thermospin effects in superconducting heterostructures

## TL;DR

This paper investigates thermospin effects in superconductor/normal metal heterostructures, revealing how thermal gradients induce spin imbalances that significantly impact superconductivity, including potential enhancement or suppression of the critical temperature.

## Contribution

It demonstrates the generation of thermospin currents leading to spin imbalances that can modify superconducting states, a novel insight into thermal control of superconductivity.

## Key findings

- Thermospin currents can cause spin imbalances comparable to Zeeman splitting.
- Spin imbalance influences the critical temperature, either enhancing or suppressing superconductivity.
- An unusual finite-temperature superconducting state can emerge due to thermal effects.

## Abstract

Recently thermally created pure spin currents were predicted for Zeeman-split superconductor/normal metal heterostructures. Here it is shown that this "thermospin" current can lead to an accumulation of a pure spin imbalance in a system. The thermally induced spin imbalance can reach the value of Zeeman splitting of the superconducting DOS and strongly influences superconductivity in the heterostructure. Depending on the temperature difference between the superconductor and the normal reservoir it can enhance the critical temperature of the superconductor or additionally suppress the zero-temperature superconducting state. The last possibility gives rise to an unusual superconducting state, which starts to develop at finite temperature.