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arXiv:cond-mat/9506136 · Solid State Communications

Theory for the interdependence of high-Tc superconductivity and dynamical spin fluctuations

Slawomir Janusz Grabowski, Jörg Schmalian, Marcel Langer, Karl H. Bennemann

Published May 1, 1996• 12 citations
arXivHTMLPDF
DOI
10.1016/0038-1098(95)00842-x

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Using an extended dynamical cluster approximation we study superconductivity in the two-dimensional t-J model. In analogy to the extended dynamical mean field theory, non-local spin fluctuations are treated self-consistently with an additional Bosonic bath. To solve the effective cluster problem, we employ an extended non-crossing approximation which allows for transitions to the symmetry-broken state. At sufficiently low temperatures we find a stable superconducting solution with d-wave order parameter. Upon pairing, the exchange energy is lowered, consistent with an exchange-based pairing mechanism.