Magnetothermal cooling with a phase separated manganite

TL;DR

This paper demonstrates that applying a magnetic field to a phase-separated manganite under current can cause a significant and abrupt temperature decrease, suggesting potential for magnetothermal cooling applications.

Contribution

It reveals a novel magnetothermal cooling effect in a manganite, driven by combined magnetic field and current, with detailed analysis of the temperature change and magnetoresistance behavior.

Findings

Temperature drops up to 45 K under magnetic field

Abrupt magnetoresistance step observed at critical field

Effect depends on current amplitude and temperature

Abstract

We show that temperature of a current (I = 20 mA) carrying manganite (Nd0.5Ca0.5Mn0.93Ni0.07O3) in presence of a magnetic field (H) decreases abruptly as much as deltaT = 45 K (7 K) accompanied by a step like decrease in magnetoresistance at a critical value of H when the base temperature is 40 K (100 K). The magnitude of deltaT and the position of magnetoresistance step decrease towards lower H with decreasing amplitude of the current. We discuss possible origins of the current and magnetic- field driven temperature change which may find applications in magnetothermal refrigeration besides magnetocaloric effect.