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Abstract

We report on recent magnetic field studies on U 1−xThxBe 13 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 T L <T c for x<x c1 0.019. In the critical concentration range x c1 <x<x c2 0.0455, the critical-field curves for the mean field type of phase transition that occur at T c1 and T c2 (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 UBe 13 and U 0.9 Th 0.1 Be 13 . 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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Kromer, F., Oeschler, N., Tayama, T. et al. Magnetic Field Response in (UTh)Be13. Journal of Low Temperature Physics 126, 815–833 (2002). https://doi.org/10.1023/A:1013984905840

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