Structural and magnetic anomalies among the spin-chain compounds, Ca3Co1+xIr1-xO6
Loading...
Date
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Description
The results of x-ray diffraction, and ac and dc magnetization as a function of temperature are reported for a new class of spin-chain oxides, Ca3Co1+xIr1-xO6. While the x= 0.0, 0.3, 0.5 and 1.0 are found to form in the K4CdCl6-derived rhombhohedral (space group R-3c) structure, the x= 0.7 composition is found to undergo a monoclinic distortion in contrast to a literature report. Apparently, the change in the crystal symmetry with x manifests itself as a change in the sign of paramagnetic Curie temperature for this composition as though magnetic coupling sensitively depends on such crystallographic distortions. All the compositions exhibit spin-glass anomalies with an unusually large frequency dependence of the peak temperature in ac susceptibility in a temperature range below 50 K, interestingly obeying Voger-Fulcher relationship even for the stoichiometric compounds.
Special Issue of Proc. Indian Academy of Sciences (Chemical Sciences) In press
Special Issue of Proc. Indian Academy of Sciences (Chemical Sciences) In press