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Berezinskii-Kosterlitz-Thouless Transition in Spin-Charge Separated Superconductor

J. P. Rodriguez
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Abstract

A model for spin-charge separated superconductivity in two dimensions is introduced where the phases of the spinon and holon order parameters couple gauge-invariantly to a statistical gauge-field representing chiral spin-fluctuations. The model is analyzed in the continuum limit and in the low-temperature limit. In both cases we find that physical electronic phase correlations show a superconducting-normal phase transition of the Berezinskii-Kosterlitz-Thouless type, while statistical gauge-field excitations are found to be strictly gapless. The normal-to-superconductor phase boundary for this model is also obtained as a function of carrier density, where we find that its shape compares favorably with that of the experimentally observed phase diagram for the oxide superconductors.

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J. P. Rodriguez. 1994-03-01. Berezinskii-Kosterlitz-Thouless Transition in Spin-Charge Separated Superconductor. https://doi.org/10.1103/physrevb.49.9831

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