Electronic Inhomogeneity and Breakdown of the Universal Thermal Conductivity in Cuprate Superconductors

Details Electronic Inhomogeneity and Breakdown of the Universal Thermal Conductivity in Cuprate Superconductors Electronic Inhomogeneity and Breakdown of the Universal Thermal Conductivity in Cuprate Superconductors

2005-11-18

arxiv.org/abs/cond-mat/0511452v2

Phys. Rev. Lett. 96, 017008 (2006)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, final version (with minor revisions) to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.96.017008

We report systematic, high-precision measurements of the low-T (down to 70 mK) thermal conductivity \kappa of YBa_{2}Cu_{3}O_{y}, La_{2-x}Sr_{x}CuO_{4} and Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta}. Careful examinations of the Zn- and hole-doping dependences of the residual thermal conductivity \kappa_{0}/T, as well as the in-plane anisotropy of \kappa_{0}/T in Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta}, indicate a breakdown of the universal thermal conductivity, a notable theoretical prediction for d-wave superconductors. Our results point to an important role of electronic inhomogeneities, that are not considered in the standard perturbation theory for thermal conductivity, in the under- to optimally-doped regime.

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