Sudheendra, L. ; Seikh, Motin ; Raju, A. R. ; Narayana, Chandrabhas ; Rao, C. N. R. (2004) Dielectric properties of rare earth cobaltates, LnCoO3 (Ln = La, Pr, Nd), across the spin-state transition Ferroelectrics, 306 (1). pp. 227-234. ISSN 0015-0193
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Official URL: http://www.tandfonline.com/doi/abs/10.1080/0015019...
Related URL: http://dx.doi.org/10.1080/00150190490460876
Abstract
Dielectric properties of the rare earth cobaltates, LnCoO3 (Ln = La, Pr and Gd), have been measured over the 85-300 K range at different frequencies. The dielectric constants increase markedly across the low-spin to intermediate-spin state transitions of the Co3+ ions. The temperature variation of the loss-tangent data as well as the vibrational spectra suggests the role of coupling of the Jahn-Teller distortion of the intermediate-spin state to the phonons and hence the dielectric relaxation. The dielectric behavior of the cobaltates is in many ways comparable to those of relaxor ferroelectrics.
Item Type: | Article |
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Source: | Copyright of this article belongs to Taylor and Francis Group. |
Keywords: | Cobaltates; Spin-state Transition; Dielectric Constant; Jahn-teller Distortion; Vibrational Spectra |
ID Code: | 54821 |
Deposited On: | 12 Aug 2011 13:49 |
Last Modified: | 12 Aug 2011 13:49 |
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