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Superconductivity in heavy-fermion U(Pt,Pd)3 and its interplay with magnetism

R. J. Keizer·A. de Visser·M. J. Graf·A. A. Menovsky·J. J. M. Franse
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Abstract

The effect of Pd doping on the superconducting phase diagram of the unconventional superconductor UPt3 has been measured by (magneto)resistance, specific heat, thermal expansion and magnetostriction. Experiments on single- and polycrystalline U(Pt1-xPdx)3 for x<= 0.006 show that the superconducting transition temperatures of the A phase, Tc+, and of the B phase, Tc-, both decrease, while the splitting DTc increases at a rate of 0.30(2)K/at.%Pd. We find that DTc(x) correlates with an increase of the weak magnetic moment m(x) upon Pd doping. This provides further evidence for Ginzburg-Landau scenarios with magnetism as the symmetry breaking field, i.e. the 2D E representation and the 1D odd parity model. Only for small splittings DTc is proportional to m^2(Tc+) (DTc<= 0.05 K) as predicted. The results at larger splittings call for Ginzburg-Landau expansions beyond 4th order. The tetracritical point in the B-T plane persists till at least x= 0.002 for B perpendicular to c, while it is rapidly suppressed for B||c. Upon alloying the A and B phases gain stability at the expense of the C phase.

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R. J. Keizer, A. de Visser, M. J. Graf, A. A. Menovsky, J. J. M. Franse. 1999-03-22. Superconductivity in heavy-fermion U(Pt,Pd)3 and its interplay with magnetism. https://doi.org/10.1103/physrevb.60.10527

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