ANISOTROPY AND THE SUPERCONDUCTING PHASES OF UPT3

Recent results of several experimental studies on the superconducting behaviour of UPt3 are reviewed. Special attention is given to the qualitative features: 1) the existence of two transitions at H = 0 and the phase diagram under a magnetic field applied both parallel (H{norm of matrix}c) and perpendicular (H⊥c) to the hexagonal axis, established by specific heat measurements, 2) the suppression of the high-temperature phase by a small hydrostatic pressure, 3) the reversal of the hitherto apparent correlation between the strength of the electron-electron interactions in the normal state and the onset of superconductivity, when investigated for each crystallographic axis separately by means of uniaxial stress and 4) the sharp break in the slopes of both the critical fields Hc1(T) and Hc2(T) for H⊥c. © 1990.