Bosonic high-Tc superconductivity in two dimensions
W. Zhu, H. Kang, Y. C. Lee, Jin Chang Chen
DOI 10.1103/PhysRevB.50.10302 · Physical Review B
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Abstract
The mixed boson-fermion model of superconductivity of Friedberg and Lee is adapted to two dimensions. Owing to the finite correlation length l(T), Bose-Einstein (BE) condensation can prevail only for a finite, but still macroscopic system. It is shown that for T<Tc∼40 K, BE condensation of charged bosons that are converted from fermion (electron or hole) pairs leads not only to a perfect Meissner effect but also an energy gap in the fermion excitation spectrum. For the temperature range Tc<T<TMay, where TMay depends, in part, on the thickness of the two-dimensional layer, although the system shows no vestige of BE condensation, a near-perfect Meissner effect would yet persist until T≃TMay∼150 K, based on the adaptation of the theory of May to the present model.
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