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Influence of La and Gd Impurities on the Two Phase Transitions in U0.97Th0.03Be13

Influence of La and Gd Impurities on the Two Phase Transitions in U0.97Th0.03Be13 The phase diagram of U 1−x Th x Be 13 exhibits two irregular points at x C1=1.9 at.% and x C2=4.55 at.% which mark the endpoints of the concentration range where two phase transitions in specific heat measurements are observed. While it is clear that the upper one belongs to a superconducting phase transition, there are different interpretations for the lower one. It has been suggested that the lower transition involves magnetic correlations which coexist with a single superconducting state or that the lower transition separates two different superconducting states (one or both are probably non-s-wave like). In this scenario the onset of local magnetic order is discussed as being due to an accompanied antiferromagnetic transition or as a product of broken time reversal symmetry. To get more information about the nature of the two superconducting phases, substitution experiments with non-magnetic La and magnetic Gd on the U sites in U 0.97 Th 0.03 Be 13 were performed. From specific heat measurements we argue that the upper transition behaves with La/Gd doping like a conventional s-wave superconductor, whereas the lower transition cannot be brought in line with common pictures of superconducting transitions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Low Temperature Physics Springer Journals

Influence of La and Gd Impurities on the Two Phase Transitions in U0.97Th0.03Be13

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References (12)

Publisher
Springer Journals
Copyright
Copyright © 1999 by Plenum Publishing Corporation
Subject
Physics; Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials
ISSN
0022-2291
eISSN
1573-7357
DOI
10.1023/A:1021853920799
Publisher site
See Article on Publisher Site

Abstract

The phase diagram of U 1−x Th x Be 13 exhibits two irregular points at x C1=1.9 at.% and x C2=4.55 at.% which mark the endpoints of the concentration range where two phase transitions in specific heat measurements are observed. While it is clear that the upper one belongs to a superconducting phase transition, there are different interpretations for the lower one. It has been suggested that the lower transition involves magnetic correlations which coexist with a single superconducting state or that the lower transition separates two different superconducting states (one or both are probably non-s-wave like). In this scenario the onset of local magnetic order is discussed as being due to an accompanied antiferromagnetic transition or as a product of broken time reversal symmetry. To get more information about the nature of the two superconducting phases, substitution experiments with non-magnetic La and magnetic Gd on the U sites in U 0.97 Th 0.03 Be 13 were performed. From specific heat measurements we argue that the upper transition behaves with La/Gd doping like a conventional s-wave superconductor, whereas the lower transition cannot be brought in line with common pictures of superconducting transitions.

Journal

Journal of Low Temperature Physics – Springer Journals

Published: Oct 14, 2004

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