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Magnetic Instability in Strongly Correlated Superconductors

Bogdan A. Bernevig·Robert B. Laughlin·David I. Santiago
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Abstract

Recently a new phenomenological Hamiltonian has been proposed to describe the superconducting cuprates. This so-called Gossamer Hamiltonian is an apt model for a superconductor with strong on-site Coulomb repulsion betweenthe electrons. It is shown that as one approaches half-filling the Gossamer superconductor, and hence the superconducting state, with strong repulsion is unstable toward an antiferromagnetic insulator an can undergo a quantum phase transition to such an insulator if one increases the on-site Coulomb repulsion.

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Bogdan A. Bernevig, Robert B. Laughlin, David I. Santiago. 2003-03-03. Magnetic Instability in Strongly Correlated Superconductors. https://doi.org/10.1103/physrevlett.91.147003

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