Fermi-Liquid Ground State in Overdoped Cuprates

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  • 6 February 2002
Abstract
The transport of heat and charge in the overdoped cuprate superconductor Tl_2Ba_2CuO_(6+delta) was measured down to very low temperature. In the normal state, obtained by applying a magnetic field greater than the upper critical field, the Wiedemann-Franz law is verified to hold perfectly. In the superconducting state, a large residual linear term is observed in the thermal conductivity, in good quantitative agreement with BCS theory for a pure d-wave superconductor. These results are compelling evidence that the electrons in the overdoped regime of cuprates form a Fermi liquid, with no indication of spin-charge separation.

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