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Anomalous thermal conductivity of NaV2O5 as compared to conventional spin-Peierls system CuGeO3

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arxiv cond-mat/9806156 v1 pith:KC2RMOAA submitted 1998-06-12 cond-mat.str-el

A. N. Vasil'ev (1) , V. V. Pryadun (1) , D. I. Khomskii (2) , G. Dhalenne (3) , A. Revcolevschi (3) , M. Isobe (4) , Y. Ueda (4) ((1) Low Temperature Physics Department , Moscow State University
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Moscow Russia (2) Solid State Physics Department University of Groningen Groningen The Netherlands (3) Laboratoire de Chimie des Solides Universite Paris France (4) Institute for Solid State Physics The University of Tokyo Tokyo Japan)
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keywords nav2o5cugeo3thermaltransitionanomalycomparedconductivitydifferent
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A huge increase of thermal conductivity k is observed at the phase transition in stoichiometric NaV2O5. This anomaly decreases and gradually disappears with deviation from stoichiometry in Na(1-x}V2O5 (x = 0.01, 0.02, 0.03, and 0.04). This behavior is compared with that of pure and Zn-doped CuGeO3 where only modest kinks in the k(T) curves are observed at the spin-Peierls transition. The change of k at critical temperature Tc could be partially attributed to the opening of an energy gap in the magnetic excitation spectrum excluding the scattering of thermal phonons on spin fluctuations. However, the reason for such a strong anomaly in the k(T) may lie not only in the different energy scales of CuGeO3 and NaV2O5, but also in the different character of the phase transition in NaV2O5 which can have largely a structural origin, e.g. connected with the charge ordering.

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