Magnetic frustration in a stoichiometric spin-chain compound, Ca3CoIrO6
Abstract
The temperature dependent ac and dc magnetization and heat capacity data of Ca3CoIrO6, a spin-chain compound crystallizing in a K4CdCl6-derived rhombohedral structure, show the features due to magnetic ordering of a frustrated-type below about 30 K, however without exhibiting the signatures of the so-called "partially disordered antiferromagnetic structure" encountered in the isostructural compounds, Ca3Co2O6 and Ca3CoRhO6. This class of compounds thus provides a variety for probing the consequences of magnetic frustration due to topological reasons in stoichiometric spin-chain materials, presumably arising from subtle differences in the interchain and intrachain magnetic coupling strengths. This compound presents additional interesting situations in the sense that, ac susceptibility exhibits a large frequency dependence in the vicinity of 30 K uncharacteristic of conventional spin-glasses, with this frustrated magnetic state being robust to the application of external magnetic fields.
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