Anomalous Superconductivity and Antiferromagnetism in the U(Pt,Pd)3 System
J.J.M. Franse
Universiteit van Amsterdam, Spui 21, Amsterdam, The Netherlands
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Received: September 20, 2001
A review is presented of the anomalous magnetic and superconducting properties of the heavy-fermion compound UPt3 that has been a subject of extensive study during the past twenty years. The normal-state and superconducting properties of the compound were evaluated from magnetic, transport, and thermodynamic studies. In addition, neutron-diffraction and muon spin relaxation experiments were performed in the normal and superconducting states. The compound is characterized by a multiple superconducting phase diagram and by the coexistence of superconductivity and short-range antiferromagnetic interactions with quasi-static moments of the order of 10-2μB/U-atom. Upon substituting Pt by Pd, the short-range magnetic interactions give way to long-range antiferromagnetic order with a maximal ordering temperature of 6 K for the 5 at.% Pd alloy and a magnetic moment of 0.6μB/U-atom. Superconductivity and long-range antiferromagnetic order are in competition resulting in a critical composition of 0.6 at.% Pd. At this concentration, non-Fermi liquid behaviour is observed.
DOI: 10.12693/APhysPolA.100.153
PACS numbers: 71.27.+a, 74.70.Tx, 75.30.Mb