Observation of giant magnetocaloric effect in HoCoSi

TL;DR

This paper reports the discovery of a giant magnetocaloric effect in HoCoSi, showing significant magnetic entropy change and refrigerant capacity near 15 K, indicating its potential for low-temperature magnetic refrigeration.

Contribution

It presents the first detailed study of HoCoSi's magnetocaloric properties, demonstrating its large entropy change and capacity at low magnetic fields.

Findings

Large magnetic entropy change of 13 J/kg K at 20 kOe

Refrigerant capacity of 135 J/kg at 20 kOe

Adiabatic temperature change of ~3 K at low fields

Abstract

We report the magnetic and magnetocaloric properties of HoCoSi, which shows second order ferro-para magnetic transition at 14 K. It is found to exhibit a large magnetic entropy change of 13 J/kg K for a field change of 20 kOe, which increases to 20.5 J/kg K at 50 kOe. The refrigerant capacity is found to be 135 and 410 J/kg for 20 and 50 kOe, respectively. The large, low-field adiabatic temperature change (~ 3 K) and a large refrigerant capacity make this compound a suitable candidate for magnetic refrigeration applications at around 15 K.