Magnetic Instability in Strongly Correlated Superconductors
Bogdan A. Bernevig, Robert B. Laughlin, David I. Santiago
DOI 10.1103/PhysRevLett.91.147003 · Physical Review Letters
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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 between the electrons. It is shown that at half-filling the Gossamer superconductor with strong repulsion is unstable toward an antiferromagnetic insulator. The superconducting state undergoes a quantum phase transition to an antiferromagnetic insulator as one increases the on-site Coulomb repulsion. Near the transition the Gossamer superconductor becomes spectroscopically indistinguishable from the insulator.
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