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A huge increase of thermal conductivity k is observed at the phase transitionin stoichiometric NaV2O5. This anomaly decreases and gradually disappears withdeviation 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 onlymodest 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 theopening of an energy gap in the magnetic excitation spectrum excluding thescattering of thermal phonons on spin fluctuations. However, the reason forsuch a strong anomaly in the k(T) may lie not only in the different energyscales of CuGeO3 and NaV2O5, but also in the different character of the phasetransition in NaV2O5 which can have largely a structural origin, e.g. connectedwith the charge ordering.Comment: PostScript 4 pages, 4 PostScript pictures. Submitted to Physical  Review Letter

physical review letters

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Anomalous Thermal Conductivity ofNaV2O5as Compared to Conventional Spin-Peierls System