An enhancement of the in-plane thermal conductivity in the superconducting state is observed in most high-T-c superconductors. Here the observation of a similar enhancement of the thermal conductivity in copper-oxide compounds, which is not related to the superconducting transition, is reported. Since this anomaly is also accompanied by a significant variation of the electrical conductivity it indicates that a strong electron-phonon coupling exists and that thermal-conductivity enhancements in copper-oxide compounds should be attributed to an increase of its lattice component.
Cassart, M. ; Issi, JP. ; Hejtmanek, J. ; BrissonRobin, C ; Bensalem, E. ; et. al. Thermal-conductivity enhancement in copper oxide compounds. In: Physica C: Superconductivity and its Applications, Vol. 259, no. 3-4, p. 385-391 (1996)