Gossamer Superconductivity near Antiferromagnetic Mott Insulator in Layered Organic Conductors

F. C. Zhang; J. Y. Gan; Yan Chen; Z. B. Su

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Gossamer Superconductivity near Antiferromagnetic Mott Insulator in Layered Organic Conductors

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arxiv cond-mat/0409482 v1 pith:MBB7S25U submitted 2004-09-18 cond-mat.supr-con

J. Y. Gan , Yan Chen , Z. B. Su , F. C. Zhang This is my paper · ORCID

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keywords insulatormottorganicantiferromagneticgossamerlayeredsuperconductorsconductors

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Layered organic superconductors are on the verge of the Mott insulator. We use Gutzwiller variational method to study a Hubbard model including a spin exchange coupling term. The ground state is found to be a Gossamer superconductor at small on-site Coulomb repulsion U and an antiferromagnetic Mott insulator at large U, separated by a first order phase transition. Our theory is qualitatively consistent with major experiments reported in organic superconductors.

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