Heat conduction and thermal expansion of YBa2Cu3O7−δ at low temperature

Sparn, G.; Schiebeling, W.; Lang, M.; Held, R.; Gottwick, U.; Steglich, F.; Rietschel, H.

doi:10.1016/S0921-4534(88)80200-4

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Heat conduction and thermal expansion of YBa₂Cu₃O_7−δ at low temperature

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Sparn, G., Schiebeling, W., Lang, M., Held, R., Gottwick, U., Steglich, F., et al. (1988). Heat conduction and thermal expansion of YBa₂Cu₃O_7−δ at low temperature. Physica C, 153, 1010-1011. doi:10.1016/S0921-4534(88)80200-4.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-D49C-B

Abstract

The thermal conductivity к(T) of sintered YBa2Cu3O7-δ samples follows a T3 dependence for T ≦ 0.8K due to the phonon size effect. For superconducting material (δ = 0.1), an additional linear term AT exists in к(T) which is absent in the semiconducting samples (δ > 0:63). This aT term is attributed to some low-energy excitations different from phonons. The low-T thermal expansion of all samples studied is dominated by extrinsic effects.