Superparamagnetic-like ac susceptibility behavior in a "partially disordered antiferromagnetic" compound, Ca$_3$CoRhO$_6$

TL;DR

This study investigates the magnetic properties of Ca$_3$CoRhO$_6$, revealing superparamagnetic-like ac susceptibility behavior in a compound with a partially disordered antiferromagnetic structure, challenging existing understanding.

Contribution

It reports unexpected superparamagnetic-like ac susceptibility in Ca$_3$CoRhO$_6$, a compound with a partially disordered antiferromagnetic structure, highlighting complex magnetic dynamics.

Findings

Large frequency dependence of ac susceptibility in 30-90 K range

No difference in isothermal remanent magnetization below 90 K

Calls for further investigations into the compound's magnetism

Abstract

We report the results of dc and ac magnetization measurements as a function of temperature (1.8 - 300 K) for the spin chain compound, Ca$_3$CoRhO$_6$, which has been recently reported to exhibit a partially disordered antiferromagnetic (PDAF) structure in the range 30 - 90 K and spin-glass freezing below 30 K. We observe an unexpectedly large frequency dependence of ac susceptibility in the T range 30 - 90 K, typical of superparamagnets. In addition, we find that there is no difference in the isothermal remanent magnetization behavior for the two regimes below 90 K. These findings call for more investigations to understand the magnetism of this compound.