The observation of a positive magnetoresistance and close correlation among lattice, spin and charge around TC in antipervoskite SnCMn3

TL;DR

This study systematically investigates the magnetic, electrical, and thermal properties of SnCMn3, revealing a positive magnetoresistance and strong interactions among lattice, spin, and charge near the transition temperature, characteristic of Mn-based antiperovskites.

Contribution

It provides new insights into the coupling of lattice, spin, and charge degrees of freedom around the phase transition in SnCMn3, a Mn-based antiperovskite.

Findings

Positive magnetoresistance (~11%) near TC

Electronic structure reconstruction at TC

Interaction among lattice, spin, and charge degrees of freedom

Abstract

The temperature dependences of magnetization, electrical transport, and thermal transport properties of antiperovskite compound SnCMn3 have been investigated systematically. A positive magnetoresistance (~11%) is observed around the ferrimagnetic-paramagnetic transition (TC ~ 280 K) in the field of 50 kOe, which can be attributed to the field-induced magnetic phase transition. The abnormalities of resistivity, Seebeck coefficient, normal Hall effect and thermal conductivity near TC are suggested to be associated with an abrupt reconstruction of electronic structure. Further, our results indicate an essential interaction among lattice, spin and charge degrees of freedom around TC. Such an interaction among various degrees of freedom associated with sudden phase transition is suggested to be characteristic of Mn-based antiperovskite compounds.