Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-06-12
Physics
Condensed Matter
Strongly Correlated Electrons
PostScript 4 pages, 4 PostScript pictures. Submitted to Physical Review Letters
Scientific paper
10.1103/PhysRevLett.81.1949
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.
Dhalenne Guy
Isobe Masaharu
Khomskii Daniel I.
Pryadun V. V.
Revcolevschi Alexandre
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