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 H-T plane in the heavy-fermion 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