Breakdown of Fermi-liquid theory in a copper-oxide superconductor
Robert W. Hill,Cyril Proust,Cyril Proust,Louis Taillefer,Patrick Fournier,Patrick Fournier,Richard L. Greene +6 more
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TLDR
An experimental test of the Wiedemann–Franz law in the normal state of a copper-oxide superconductor, (Pr,Ce)2CuO4, reveals that the elementary excitations that carry heat in this material are not fermions, compelling evidence for the breakdown of Fermi-liquid theory in high-temperature superconductors.Abstract:
The behaviour of electrons in solids is well described by Landau's Fermi-liquid theory, which predicts that although electrons in a metal interact, they can still be treated as well defined fermions, which are called 'quasiparticles'. At low temperatures, the ability of quasiparticles to transport heat is given strictly by their ability to transport charge, as described by a universal relation known as the Wiedemann-Franz law, which hitherto no material 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 an experimental test of the Wiedemann-Franz law in the normal state of a copper-oxide superconductor, (Pr,Ce)2CuO4, which reveals that the elementary excitations that carry heat in this material are not fermions. This is compelling evidence for the breakdown of Fermi-liquid theory in high-temperature superconductors.read more
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Observation of the Dirac fluid and the breakdown of the Wiedemann-Franz law in graphene
Jesse Crossno,Jing K. Shi,Ke Wang,Xiaomeng Liu,Achim Harzheim,Andrew Lucas,Subir Sachdev,Subir Sachdev,Philip Kim,Takashi Taniguchi,Kenji Watanabe,Thomas A. Ohki,Kin Chung Fong +12 more
TL;DR: Employing high-sensitivity Johnson noise thermometry, an order of magnitude increase in the thermal conductivity and the breakdown of the Wiedemann-Franz law is reported in the thermally populated charge-neutral plasma in graphene, a signature of the Dirac fluid and constitutes direct evidence of collective motion in a quantum electronic fluid.
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Anomalously low electronic thermal conductivity in metallic vanadium dioxide
Sangwook Lee,Sangwook Lee,Kedar Hippalgaonkar,Kedar Hippalgaonkar,Fan Yang,Fan Yang,Jiawang Hong,Jiawang Hong,Changhyun Ko,Joonki Suh,Kai Liu,Kai Liu,Kevin Wang,Jeffrey J. Urban,Xiang Zhang,Xiang Zhang,Xiang Zhang,Chris Dames,Chris Dames,Sean A. Hartnoll,Olivier Delaire,Olivier Delaire,Junqiao Wu,Junqiao Wu +23 more
TL;DR: An order-of-magnitude breakdown of the Wiedemann-Franz law is reported at high temperatures ranging from 240 to 340 kelvin in metallic vanadium dioxide in the vicinity of its metal-insulator transition.
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SO(5) theory of antiferromagnetism and superconductivity
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