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ID:
17775.0,
MPI für Chemische Physik fester Stoffe / publications 2002 |
Magnetic Field Response in (UTh)Be13 |
Authors: | Kromer, F.; Oeschler, N.; Tayama, T.; Tenya, K.; Cichorek, T.; Lang, M.; Steglich, F.; Kim, J. S.; Stewart, G. R. | Language: | English | Date of Publication (YYYY-MM-DD): | 2002-02 | Title of Journal: | Journal of Low Temperature Physics | Journal Abbrev.: | J. Low Temp. Phys. | Volume: | 126 | Issue / Number: | 3-4 | Start Page: | 815 | End Page: | 833 | Review Status: | Peer-review | Audience: | Not Specified | Abstract / Description: | We report on recent magnetic field studies on U1-xThxBe13 with x less than or equal to 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) approximate to 0.019. In the critical concentration range x(cl) < x < x(c2) approximate to 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 approximate to x(c2) is rather unusual: A negative normal-state contribution, alpha(n), 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, chi((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, chi((3)) remains negative down to T approximate to 100 mK, the lowest temperature investigated. | Comment of the Author/Creator: | Date: 2002, FEB | External Publication Status: | published | Document Type: | Article |
Communicated by: | Ina Wanschura | Affiliations: | MPI für chemische Physik fester Stoffe
| External Affiliations: | Max Planck Inst Chem Phys Solids, Dresden, Germany; Max Planck Inst Chem Phys Solids, Dresden, Germany; Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba, Japan; Univ Frankfurt, Inst Phys, D-6000 Frankfurt, Germany; Univ Florida, Dept Phys, Gainesville, FL 32611 USA
| Identifiers: | ISI:000174163100004 [ID No:1] ISSN:0022-2291 [ID No:2] | |
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