Order-parameter symmetries, phase diagrams, and physical properties of two-dimensional unconventional superconductors. I. d-wave-pairing superconductivity

Yu. M. Gufan; G. M. Vereshkov; P. Tolédano; B. Mettout; R. Bouzerar; V. Lorman

doi:10.1103/PhysRevB.51.9219

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Order-parameter symmetries, phase diagrams, and physical properties of two-dimensional unconventional superconductors. I. d-wave-pairing superconductivity

Yu. M. Gufan, G. M. Vereshkov, P. Tolédano, B. Mettout, R. Bouzerar, V. Lorman

DOI 10.1103/PhysRevB.51.9219 · Physical Review B

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Abstract

The full set of possible stable states which may arise in two-dimensional superconducting systems, when assuming a d-pairing-wave order parameter, are worked out in the framework of a generalized Landau theory, in which a nontruncated order-parameter expansion is used. The phase diagrams, macroscopic tensors, and gap functions are calculated for three structural symmetries of the normal state: ∞m, 4mm, and mm2. The superconducting states can be distinguished by their elastic properties, by the orbital paramagnetic or ferromagnetic type order of the condensate, and by their gap functions. A number of recent experimental measurements on the cuprate superconductors are reinterpreted in light of the obtained theoretical results.