Thermal Conductivity of the Spin Peierls Compound CuGeO_3

Abstract

The thermal conductivity of the Spin-Peierls (SP) compound CuGeO_3 was measured in magnetic fields up to 16 T. Above the SP transition, the heat transport due to spin excitations causes a peak at around 22 K, while below the transition the spin excitations rapidly diminish and the heat transport is dominated by phonons; however, the main scattering process of the phonons is with spin excitations, which demonstrates itself in an unusual peak in the thermal conductivity at about 5.5 K. This low-temperature peak is strongly suppressed with magnetic fields in excess of 12.5 T.

arXiv comment6 pages, including 2 postscript figures

References in corpus (4)

• Study of the magnetic susceptibility in the spin-Peierls system CuGeO${}_3$
• Spin fluctuations in CuGeO${}_3$ probed by light scattering
• The J_1-J_2 model revisited : Phenomenology of CuGeO_3
• On the Incommensurate Phase of Pure and Doped Spin-Peierls System CuGeO_3

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