Nature of magnetism in the spin-chain compound, Ca3CuRuO6

TL;DR

This study investigates the magnetic properties of Ca3CuRuO6, revealing inhomogeneous magnetism and geometrical frustration effects in a quasi-one-dimensional compound through magnetization and heat capacity measurements.

Contribution

It provides new insights into the complex magnetic behavior and frustration effects in Ca3CuRuO6, a quasi-one-dimensional compound, using experimental magnetization and heat capacity data.

Findings

Magnetic ordering occurs around 40 K.

Large negative Curie temperature indicates strong antiferromagnetic interactions.

Evidence suggests inhomogeneous magnetism due to disorder in the chains.

Abstract

A quasi one-dimensional compound, Ca3CuRuO6, has been synthesized by solid-state reaction method and studied using magnetization (M) and heat capacity (C) measurements. This compound undergoes magnetic ordering (T_o) around 40 K, as evidenced by the dc magnetic susceptibility (chi) behavior. However, the magnitude of the paramagnetic Curie temperature (theta_p) obtained from the high temperature linear region is large (-277 K, with the negative sign indicating antiferromagnetic interaction). The reduction of T_o, compared to theta_p, is attributed to geometrical frustration effect arising from the triangular arrangement of antiferromagnetically coupled magnetic chains. The absence of a feature in ac chi around 40 K rules out possible spin-glass freezing. However, we find that the peak in C(T) around 40 K is weak, with the entropy change associated with the transition being negligible, typical of a disordered magnetism. We infer that this material thus exhibits inhomogeneous magnetism, despite being stoichiometric, presumably due to an interplay between disorder in the Cu-Ru chain.