Geometrically frustrated magnetic behavior of Sr3NiRhO6 and Sr3NiPtO6

TL;DR

This study investigates the magnetic frustration in Sr3NiRhO6 and Sr3NiPtO6, revealing distinct magnetic behaviors and transitions due to their geometrically frustrated chain structures.

Contribution

It provides a comparative analysis of magnetic frustration mechanisms in two related compounds with different magnetic transition behaviors.

Findings

Sr3NiRhO6 exhibits two magnetic transitions and frequency-dependent susceptibility.

Sr3NiPtO6 shows no long-range magnetic order down to 1.8 K.

Both compounds demonstrate magnetic frustration with different manifestations.

Abstract

The results of ac and dc magnetic susceptibility isothermal magnetization and heat-capacity measurements as a function of temperature (T) are reported for Sr3NiRhO6 and Sr3NiPtO6 containing magnetic chains arranged in a triangular fashion in the basal plane and crystallizing in K4CdCl6-derived rhombohedral structure. The results establish that both the compounds are magnetically frustrated, however in different ways. In the case of the Rh compound, the susceptibility data reveal that there are two magnetic transitions, one in the range 10 -15 K and the other appearing as a smooth crossover near 45 K, with a large frequency dependence of ac susceptibility in the range 10 to 40 K; in addition, the features in C(T) are smeared out at these temperatures. The magnetic properties are comparable to those of previously known few compounds with partially disordered antiferromagnetic structure. On the other hand, for Sr3NiPtO6, there is no evidence for long-range magnetic ordering down to 1.8 K despite large value of paramagnetic Curie temperature.