Breakdown of Fermi-liquid theory in a cuprate superconductor

Details Breakdown of Fermi-liquid theory in a cuprate superconductor Breakdown of Fermi-liquid theory in a cuprate superconductor

2001-12-14

arxiv.org/abs/cond-mat/0112269v1

NATURE VOL 414 P.711 (2001)

Physics

Condensed Matter

Superconductivity

7 pages, 3 figures

Scientific paper

10.1038/414711a

The behaviour of electrons in solids is remarkably well described by Landau's Fermi-liquid theory, which says that even though electrons in a metal interact they can still be treated as well-defined fermions, called ``quasiparticles''. At low temperature, the ability of quasiparticles to transport heat is strictly given by their ability to transport charge, via a universal relation known as the Wiedemann-Franz law, which no material in nature has been known to violate. High-temperature superconductors have long been thought to fall outside the realm of Fermi-liquid theory, as suggested by several anomalous properties, but this has yet to be shown conclusively. Here we report on the first experimental test of the Wiedemann-Franz law in a cuprate superconductor, (Pr,Ce)$_2$CuO$_4$. Our study reveals a clear departure from the universal law and provides compelling evidence for the breakdown of Fermi-liquid theory in high-temperature superconductors.

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