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On the magnetic and superconducting phases of heavy-fermion UPt 3

The electronic instability in the highly correlated electron system UPt 3 gives rise to various intriguing phenomena at liquid-helium temperatures, among which the occurrence of unconventional superconductivity (T + = 0.49 K, T c = 0.44 K) has attracted most attention. In a magnetic field three superconducting phases are observed that meet at a tetracritical point. We here present a discussion of a number of puzzling aspects of a superconducting phase diagram (B±c) of unprecedented accuracy, determined by dilatometry. The possible interplay of superconductivity and reduced moment antiferromagnetism (T N = 5 K) is investigated. Furthermore, we report on recent studies of the suppression of T¢, by alloying with Pd, Y, Th, Au and Ir.