Abstract
We report on recent magnetic field studies on U1−xThxBe13 with x≤0.1. These new results are related to previous data published by Kromer et al. [F. Kromer et al., Phys. Rev. B 62, 12477 (2000)]. The new magnetization measurements confirm the existence of an anomaly found earlier through calorimetric and dilatometric measurements at TL<Tc for x<xc1≈0.019. In the critical concentration range xc1<x<xc2≈0.0455, the critical-field curves for the mean field type of phase transition that occur at Tc1 and Tc2 (at zero field) appear to merge as T→0. This interesting fact which has been inferred already from the previous measurements could be confirmed for a sample with x=0.038. The normal state for Th concentrations x≈xc2 is rather unusual: A negative normal-state contribution, αn, is observed in the thermal expansion coefficient as well as the occurrence of a positive peak when superconductivity is suppressed by a magnetic field. Both effects are studied in detail and a comparison to specific heat results is given. Finally, we have investigated the non-linear contribution to the magnetization, χ(3), of UBe13 and U0.9Th0.1Be13. In contradiction to suggestions made previously by Aliev et al. [Aliev et al., Europhys. Lett. 32, 765 (1995)] for x=0.1, χ(3) remains negative down to T≈100 mK, the lowest temperature investigated.
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