Rayaprol, S. ; Sengupta, Kausik ; Sampathkumaran, E. V. (2003) Structural and magnetic anomalies among the spin-chain compounds, Ca3Co1+xIr1−xO6 Proceedings of the Indian Academy of Sciences - Chemical Sciences, 115 (5&6). pp. 553-560. ISSN 0253-4134
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Official URL: http://www.ias.ac.in/chemsci/Pdf-OctDec2003/Pc3342...
Related URL: http://dx.doi.org/10.1007/BF02708247
Abstract
The results of X-ray diffraction, and ac and dc magnetisation 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 R3̅c ) 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 Vogel-Fulcher relationship even for the stoichiometric compounds.
Item Type: | Article |
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Source: | Copyright of this article belongs to Indian Academy of Sciences. |
Keywords: | Ca3Co1+xIr1−xO6; Spin-chain Oxides; Spin-glass |
ID Code: | 45692 |
Deposited On: | 29 Jun 2011 03:30 |
Last Modified: | 18 May 2016 01:53 |
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