Volume 36, Number 7, December I 1996
|Page(s)||545 - 550|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Search for a spontaneous magnetization in the superconducting B-phase of UPt3
Department of Physics, Faculty of Science, Nagoya University
Nagoya 464-01, Japan
2 Department of Physics, Faculty of Science, Osaka University Toyonaka, Osaka 560, Japan
3 Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-11, Japan
Accepted: 18 October 1996
We report the results of a search for a spontaneous magnetization in the superconducting B-phase of which is predicted to exist because of broken time-reversal symmetry. We have measured the change of magnetic flux upon the superconducting transition in a field very close to zero by using a SQUID magnetometer. Our result gives the upper limit of 2 mG for the spontaneous internal field, one order of magnitude smaller than obtained by a recent measurement. The small value favors the theory of orbital degeneracy of the pair wave function over the theory of spin degeneracy.
PACS: 74.70.Tx – Heavy-fermion superconductors
© EDP Sciences, 1996
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