Evidence for a multiple superconducting gap in MgB(2) from high-resolution photoemission spectroscopy.
Phys Rev Lett
; 87(17): 177006, 2001 Oct 22.
Article
in En
| MEDLINE
| ID: mdl-11690299
ABSTRACT
We study the new binary intermetallic superconductor MgB(2) using high-resolution photoemission spectroscopy. The superconducting-state spectrum measured at 5.4 K shows a coherent peak with a shoulder structure, in sharp contrast to that expected from a simple isotropic-gap opening. The spectrum can be well reproduced using the weighted sum of two Dynes functions with the gap sizes of 1.7 and 5.6 meV. Temperature-dependent study shows that both gaps close at the bulk transition temperature. These results provide spectroscopic evidence for a multiple gap of MgB(2).
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Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Phys Rev Lett
Year:
2001
Document type:
Article
Affiliation country:
Japón