Magnetism and superconductivity of the U(Pt, Pd)3 system

Autor: N.H. van Dijk, U. Wyder, J.J.M. Franse, A. de Visser
Přispěvatelé: WZI (IoP, FNWI)
Rok vydání: 1996
Předmět:
Zdroj: Physica B-Condensed Matter, 223-224, 15-21. Elsevier
ISSN: 0921-4526
DOI: 10.1016/0921-4526(96)00028-2
Popis: The superconducting phase diagram of UPt3 has been studied by a variety of techniques, all leading to three different phases in the B T plane that meet the normal phase in a tetracritical point. Superconductivity has been reported to coexist with small-moment antiferromagnetism. The effects of substitutions on either the U site or the Pt site on the superconducting transition have been addressed in several studies. Pd substitutions for Pt play a particular role since the zero-field splitting between two superconducting phases increases from about 60 mK for pure UPt3 to about 120 mK for the 0.2 at % Pd alloy. On further increasing the Pd content, superconductivity is suppressed above 0.5 at % Pd, whereas between 2 and 10 at % Pd long-range antiferromagnetic order is observed with values of the uranium moment up to 0.6p~. The relevant questions in these Pd substitution studies are: by which mechanism is the splitting between the two zero-field superconducting phases enhanced and, secondly, in which way does the small-moment antiferromagnetism evolve into the large-moment antiferromagnetic order at higher Pd concentrations. In this contribution, the salient features are reviewed with respect to the occurrence of magnetic order and superconductivity in the pseudo-binary system or U(Pt, Pd)3 alloys, with an emphasis on dilatation experiments.
Databáze: OpenAIRE
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