Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-06-09
Physics
Condensed Matter
Strongly Correlated Electrons
A slightly different version from that of PRB version (that is to appear in print). Phys, Rev, B, in press
Scientific paper
10.1103/PhysRevB.75.214422
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.
Iyer Kartik K.
Mohapatra Niharika
Rayaprol Sudhindra
Sampathkumaran E. V.
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