A ferromagnetic-like phase transition in new oxychalcogenide HgOCuSe

TL;DR

This study reports the synthesis and characterization of a new oxychalcogenide HgOCuSe, revealing a ferromagnetic-like phase transition at 60 K and unusual magnetic hysteresis behavior.

Contribution

It introduces a new oxychalcogenide material with unique magnetic properties, including a ferromagnetic-like transition and reversed hysteresis branches.

Findings

Resistivity decreases as T^{1.75} from room temperature to 80 K.

Sharp ferromagnetic-like transition at around 60 K.

Reversed hysteresis branches at 30 K with decreasing reverse irreversibility at 5 K.

Abstract

We report the synthesis of a new oxychalcogenide HgOCuSe sample. The resistivity decreases as a function of $T^{1.75}$ with decreasing temperature from room temperature down to around 80 K. There exists a very sharp ferromagnetic-like phase transition at around 60 K under a field of $H$ = 100 Oe. Contrary to the usual ferromagnetic materials, the descending and ascending branches of the magnetic hysteresis curve, at 30 K, are reversed in the whole irreversible field range and the reverse irreversibility decreases at 5 K.