Large magnetic entropy change near room temperature in antipervoskite SnCMn3

TL;DR

This study reports a significant magnetocaloric effect near room temperature in SnCMn3, a low-cost antiperovskite, with potential applications in magnetic refrigeration due to its large entropy change and electronic structure reconstruction.

Contribution

First observation of large magnetocaloric effect in SnCMn3 near room temperature, highlighting its potential for magnetic cooling applications.

Findings

Magnetic entropy change of 80.69mJ/cm3 K at 279 K under 20 kOe

Magnetocaloric effect close to that of typical materials

Electronic structure reconstruction at transition temperature

Abstract

We report the observation of large magnetocaloric effect near room temperature in antipervoskite SnCMn3. The maximal magnetic entropy change at the first-order ferrimagnetic-paramagnetic transition temperature (TC 279 K) is about 80.69mJ/cm3 K and 133mJ/cm3 K under the magnetic field of 20 kOe and 48 kOe, respectively. These values are close to those of typical magnetocaloric materials. The large magnetocaloric effect is associated with the sharp change of lattice, resistivity and magnetization in the vicinity of TC. Through the measurements of Seebeck coefficient and normal Hall effect, the title system is found to undergo a reconstruction of electronic structure at TC. Considering its low-cost and innocuous raw materials, Mn-based antiperovskite compounds are suggested to be appropriate for pursuing new materials with larger magnetocaloric effect.