In: Journal of Superconductivity, 1997, vol. 10, no. 4, p. 273-277
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In: Pramana, 2008, vol. 70, no. 2, p. 237-243
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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.
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