COHERENCE PEAK AND SUPERCONDUCTING ENERGY-GAP IN RB3C60 OBSERVED BY MUON SPIN RELAXATION

Authors
KIEFL RF MACFARLANE WA CHOW KH DUNSIGER S DUTY TL JOHNSTON TMS SCHNEIDER JW SONIER J BRARD L STRONGIN RM FISCHER JE SMITH AB
Citation
Rf. Kiefl et al., COHERENCE PEAK AND SUPERCONDUCTING ENERGY-GAP IN RB3C60 OBSERVED BY MUON SPIN RELAXATION, Physical review letters, 70(25), 1993, pp. 3987-3990
Citations number
27
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
70
Issue
25
Year of publication
1993
Pages
3987 - 3990
Database
ISI
SICI code
0031-9007(1993)70:25<3987:CPASEI>2.0.ZU;2-B
Abstract
Muon spin relaxation resulting from spin exchange scattering of endohe dral muonium (mu+ e-) with thermal electronic excitations has been obs erved in the fullerene superconductor Rb3C60. The temperature dependen ce of T1(-1) shows a coherence peak just below T(c) and can be fit to the conventional Hebel-Slichter theory for spin relaxation in a superc onductor with a broadened BCS density of states. The average energy ga p for electronic excitations, DELTA/k(B)=53(4) K or 2DELTA/k(B)T(c)=3. 6(3), is consistent with the BCS weak-coupling limit.