Low temperature Synchrotron X-ray diffraction studies on spin lattice coupling in Co3TeO6 and Co2.5Mn0.5TeO6

TL;DR

This study uses low temperature Synchrotron X-ray Diffraction to investigate spin lattice coupling in Co3TeO6 and Co2.5Mn0.5TeO6, revealing magnetic and structural anomalies linked to their multiferroic properties.

Contribution

It provides new insights into the spin lattice coupling and magnetic phase transitions in CTO and CMTO through detailed LT-SXRD analysis.

Findings

Magnetic phase diagram of CTO shows multiple transitions.

In CMTO, a 20 K increase in antiferromagnetic transition temperature.

Structural anomalies follow magnetic anomalies, indicating spin lattice coupling.

Abstract

In the quest of understanding significant variations in the physical, chemical and electronic properties of the novel functional materials, low temperature Synchrotron X-ray Diffraction (LT-SXRD) measurements on CTO (a type-II) and CMTO (a type-I) multiferroics are presented. Magnetic phase diagram of CTO shows multiple magnetic transitions at zero fields, whereas, in CMTO, 20 K enhancement in the antiferromagnetic transition temperature is observed followed by near room temperature Griffiths phase. Rietveld analysis on LT-SXRD data of both the samples indicates important observations. For both CTO and CMTO, the magnetic anomalies are followed by structural anomalies, which is a clear signature of spin lattice coupling and the positive shift of spin lattice coupling from CTO to CMTO.