Superconducting kernel symmetry for an anisotropic superconductivity near H_C2 and phase transitions in UPt3
Abstract
The symmetry group of anisotropic Cooper pairing in magnetic field H includes the magnetic translations and rotations around H. On the basis of these operations Kasimir's operator which classifies the superconducting nuclei near H_C2 is constructed. Such kernel classification is used to find all possible reasons of kink in H_C2(T)dependence existence and to interpret the phase transitions in HT plane in the heavyfermion superconductor UPt3 at the assumption of two superconducting states coexistence. The phase transition lines in space nonuniform state H_C1<H<H_C2 is shown to be either the lines of superconducting order parameter parity violation with respect to reflection in a perpendicular to magnetic field plane or the lines of triangular vortex lattice distortion or the lines of Abricosov's lattice period multiplication. Last case near H_C1 signifies the phase transition with changing of magnetic vortex quantization.
 Publication:

Journal de Physique I
 Pub Date:
 August 1991
 DOI:
 10.1051/jp1:1991197
 Bibcode:
 1991JPhy1...1.1155L