Stability of geometrically frustrated magnetic state of Ca3CoRhO6 to applications of positive and negative pressure

TL;DR

This study investigates how external and chemical pressures affect the magnetic properties of Ca3CoRhO6, revealing remarkable stability of its geometrically frustrated magnetic state despite volume changes.

Contribution

It demonstrates that the magnetic frustration in Ca3CoRhO6 remains stable under both external pressure and chemical substitution, contrasting with previous findings on Y substitution effects.

Findings

Magnetic anomalies persist despite 4% volume change.

No significant change in magnetic properties under external pressure.

Geometrical frustration features are insensitive to volume expansion.

Abstract

The influence of negative chemical pressure induced by gradual replacement of Ca by Sr as well as of external pressure (up to 10 kbar) on the magnetism of Ca3CoRhO6 has been investigated by magnetization studies. It is found that the solid solution, Ca(3-x)Sr(x)CoRhO6, exists at least till about x= 1.0 without any change in the crystal structure. Apart from insensitivity of the spin-chain feature to volume expansion, the characteristic features of geometrical frustration interestingly appear at the same temperatures for all compositions, in sharp contrast to the response to Y substitution for Ca (reported previously). Interestingly, huge frequency dependence of ac susceptibility known for the parent compound persists for all compositions. We do not find a change in the properties under external pressure. The stability of the magnetic anomalies of this compound to the volume change (about 4%) is puzzling.