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Amperean Pairing Instability in the U(1) Spin Liquid State with Fermi Surface and Application to κ − ( BEDT − TTF ) 2 Cu 2 <mml:mo …

2007; American Physical Society; Volume: 98; Issue: 6 Linguagem: Inglês

10.1103/physrevlett.98.067006

ISSN

1092-0145

Autores

Sung-Sik Lee, Patrick A. Lee, T. Senthil,

Tópico(s)

Physics of Superconductivity and Magnetism

Resumo

Recent experiments on the organic compound $\kappa-(BEDT-TTF)_2 Cu_2 (CN)_3$ raise the possibility that the system may be described as a quantum spin liquid. Here we propose a pairing state caused by the `Amperean' attractive interaction between spinons on a Fermi surface mediated by the U(1) gauge field. We show that this state can explain many of the observed low temperature phenomena and discuss testable consequences.

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