Thermal Conductivity of Mg-doped CuGeO_3

Details Thermal Conductivity of Mg-doped CuGeO_3 Thermal Conductivity of Mg-doped CuGeO_3

1999-05-17

arxiv.org/abs/cond-mat/9905228v2

Phys. Rev. B 61, 14700 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 6 figures

Scientific paper

10.1103/PhysRevB.61.14700

The thermal conductivity $\kappa$ is measured in a series of Cu_1-xMg_xGeO_3 single crystals in magnetic fields up to 16 T. It has turned out that heat transport by spin excitations is coherent for lightly doped samples, in which the spin-Peierls (SP) transition exists, at temperatures well above the SP transition temperature T_SP. Depression of this spin heat transport appears below T^*, at which the spin gap locally opens. T^* is not modified with Mg-doping and that T^* for each Mg-doped sample remains as high as T_SP of pure CuGeO_3, in contrast to T_SP which is strongly suppressed with Mg-doping. The spin-gap opening enhances phonon part of the heat transport because of reduced scattering by the spin excitations, producing an unusual peak. This peak diminishes when the spin gap is suppressed both in magnetic fields and with the Mg-doping.

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