Muon spin relaxation in heavy fermion systems |
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| Authors: | G M Luke A Keren L P Le Y J Uemura W D Wu D Bonn L Taillefer J D Garrett Y Ōnuki |
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| Institution: | (1) Dept. of Physics, Columbia University, 538 West 120th St., 10027 New York, NY, USA;(2) Dept. of Physics, University of British Columbia, V6T 2A3 Vancouver, B.C., Canada;(3) Dept. of Physics, McGill University, H3A 2T8 Montreal, P. Q., Canada;(4) Dept. of Physics and Inst. for Mat. Research, McMaster University, L8S 4M1 Hamilton, Ontario, Canada;(5) Inst. of Mat. Science, Univ. of Tsukuba, 305 Ibaraki, Japan |
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| Abstract: | Heavy fermion systems have received a great deal of study by a wide variety of techniques, including SR. In a number of systems, coexisting superconducting and magnetic states have been reported, leading to speculation of an intimate connection between magnetism and superconductivity in these compounds. We observe a spontaneous magnetic field in the superconducting phase of UPt3. In addition, the broadening of the transverse field muon precession signal only onsets approximately 60 mK below the superconductingT
c. Our results provide evidence that the  lower superconducting phase in theH-T phase diagram of UPt3 is characterised by broken time-reversal symmetry. Measurements of URu2Si2 and CeCu2.2Si2 indicate that the magnetically ordered volume fraction is temperature dependent in both systems. |
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