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μ+SR studies of magnetism and superconductivity of the heavy fermion superconductor UPd2Al3

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Feyerherm, R., Amato, A., Geibel, C., Gygax, F. N., Komatsubara, T., Sato, N., et al. (1994). μ+SR studies of magnetism and superconductivity of the heavy fermion superconductor UPd2Al3. Physica B-Condensed Matter, 199, 103-106. doi:10.1016/0921-4526(94)91749-3.

We present transverse field (TF) muon spin rotation (mu+SR) measurements on single crystalline UPd2Al3 carried out in the temperature range 25 mK-300 K at different fields between 350 Oe and 10 kOe. For the magnetic easy direction H perpendicular-to c-axis, the muon Knight shift shows a deviation from linear scaling with the bulk susceptibility at T < 40 K, the origin of which is unclear. TF-mu+SR in the T range 25 mK-2.5 K, aimed at determining the temperature and angular dependence of the penetration depth lambda, revealed unusual behaviour. While the observed increase of the mu+SR depolarisation rates below T(c), caused by the formation of the flux lattice, is field independent up to 10 kOe for H parallel-to c-axis, it drastically reduces with increasing field for H perpendicular-to c-axis. Assuming the formation of a regular flux lattice for H parallel-to c a value of lambda = (4200 +/- 1500) angstrom is deduced. For H perpendicular-to c, lambda = (4600 +/- 1500) angstrom at 350 Oe. The muon Knight shift is reduced by the superconducting transition, pointing to a reduction of the U-5f susceptibility of almost-equal-to 20% at T--> 0.