Temperature dependence of electronic and magnetic properties of (DOEO)$_4$[HgBr$_4$]TCE single crystals

TL;DR

This study explores how the electronic and magnetic properties of (DOEO)$_4$[HgBr$_4$]TCE single crystals change with temperature, revealing distinct phases including antiferromagnetic order and metallic behavior.

Contribution

It provides new insights into the temperature-dependent phase transitions and magnetic coupling phenomena in this organic charge-transfer salt.

Findings

Antiferromagnetic order below 40 K in the low-temperature phase.

Metallic-like behavior observed between 70-120 K.

Transition to a bad metal at higher temperatures due to increased hopping conductivity.

Abstract

The temperature dependence of electronic and magnetic properties of the organic charge-transfer salt (DOEO)$_4$[HgBr$_4$]TCE was investigated using magnetometry. Electronic transport properties revealed three distinct phases which are related to different magnetic coupling phenomena. In the low-temperature insulating phase (T<70 K) the antiferromagnetic coupling between two distinct sites of magnetic moments causes antiferromagnetic order below the N\'eel temperature T$_N$=40 K. In the temperature region 70-120 K the (DOEO)$_4$[HgBr$_4$]TCE shows metallic-like behavior and with further increasing of temperature it becomes a bad metal due to loss of itinerant character and increase of hopping conductivity of charge carriers.