The phenomenological properties of two-dimensional p-pairing-wave superconductors are worked out in the framework of a generalized Landau theory using nontruncated order-parameter expansions. The full set of stable superconducting states arising from a normal state of symmetry ∞m, 4mm, and mm2 are found. Their theoretical phase diagrams are constructed, and the physical properties of the stable states are discussed. The p-wave states are shown to be distinguishable by the structural and magnetic properties of the condensate and by the structure of their gap functions. They can be differentiated from d-pairing-wave states when the spin-orbit interaction is neglected. When spin-orbit coupling is taken into account p-pairing waves are mixed with s, d, f, g, . . . pairing waves. In this respect, the experimental results found in the oxide superconductors appear as compatible either with a mixed state or with a pure d- or p-pairing state in the absence of spin-orbit interaction.

• Received 28 March 1994

DOI:https://doi.org/10.1103/PhysRevB.51.9228