Hebel-Slichter peak and superconducting energy gap in Rb3C60 observed by muon spin relaxation
Macfarlane, W. A. ; Kiefl, R. F. ; Chow, K. H. ; Dunsiger, S. ; Duty, T. L. ; Johnston, T. M. S. ; Schneider, J. W. ; Sonier, J. ; Brard, L. ; Strongin, R. M. ; Fischer, J. E. ; Smith, A. B.
Springer
Published 1994
Springer
Published 1994
| ISSN: |
1572-9540
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|---|---|
| Source: |
Springer Online Journal Archives 1860-2000
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| Topics: |
Physics
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| Notes: |
Abstract Muon spin relaxation has been observed in both the normal and superconducting states of Rb3C60 (T c=29.3K). The field dependence of theT 1 spin relaxation rate is due to muonium undergoing spin-exchange scattering with conduction electrons, making this the first observation of muonium in a metal. The temperature dependence ofT 1 −1 shows a Hebel-Slichter coherence peak just belowT c which is not seen in13C spin relaxation. The peak can be fit assuming spin relaxation due to interaction with the quasiparticle excitations of a BCS superconductor provided the density of states is broadened relative to that of BCS. Such fits yield a value for the zero temperature energy gap, Δ0/k B , of 53(4)K, consistent with weak-coupling BCS.
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| Type of Medium: |
Electronic Resource
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| URL: |