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Circulating-current states and ring-exchange interactions in cuprates

Normand, Bruce ; Oleś, Andrzej M.

In: Physica C: Superconductivity, 2004, vol. 408-410, p. 252-253

We consider circulating charge- and spin-current states in a generalised Hubbard model for the CuO₂ planes in cuprates. We investigate the parameter regimes for these phases in microscopic calculations on small clusters. We demonstrate that a positive ring-exchange interaction enhances (suppresses) spin- (charge-)flux phases.