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Title: Dielectric Properties of Rare Earth Cobaltates, LnCoO3 (Ln La, Pr, Nd), Across the Spin-State Transition
Authors: Sudheendra, L
Seikh, Motin
Raju, R
Narayana, Chandrabhas
Rao, C N R
Keywords: Cobaltates
spin-state transition
dielectric constant
Jahn-Teller distortion
vibrational spectra
Issue Date: 2004
Publisher: Taylor & Francis Inc
Citation: Ferroelectrics 306(1), 227–234 (2004)
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.
Description: Restricted Access
Other Identifiers: 0015-0193
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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