# Magnetic refrigeration with paramagnetic semiconductors at cryogenic temperatures

## TL;DR

This paper explores using paramagnetic semiconductors for cryogenic refrigeration via adiabatic demagnetization, presenting a model that predicts performance comparable to existing materials like hydrate (CMN).

## Contribution

It introduces a theoretical model for the limits of entropy and cooling power in semiconductor-based cryogenic refrigeration systems.

## Key findings

- Performance comparable to hydrate (CMN) predicted.
- Theoretical limits to entropy and cooling power established.
- Paramagnetic semiconductors can be effective refrigerants at cryogenic temperatures.

## Abstract

We propose paramagnetic semiconductors as active media for refrigeration at cryogenic temperatures by adiabatic demagnetization. The paramagnetism of impurity dopants or structural defects can provide the entropy necessary for refrigeration at cryogenic temperatures. We present a simple model for the theoretical limitations to specific entropy and cooling power achievable by demagnetization of various semiconductor systems. Performance comparable to that of the hydrate (CMN) is predicted.