ISSN:
1572-9540
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02068935
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