Direct evidence for a multiple superconducting gap in MgB2 from high-resolution photoemission spectroscopy

Preprint

25 April 2001

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0104489

Abstract

We study the new binary intermetallic superconductor MgB2 using high-resolution photo-emission 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 MgB2.

Keywords

SUPERCONDUCTING
SUPERCONDUCTOR
INTERMETALLIC
SPECTROSCOPY
GAP IN MGB2
TEMPERATURE
SHOULDER
SPECTRUM

All Related Versions

Version 1, 2001-04-25, ArXiv
Published version: Physical Review Letters, 87 (17), 177006.

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