| Issue |
Europhys. Lett.
Volume 56, Number 2, October 2001
|
|
|---|---|---|
| Page(s) | 296 - 301 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and opticalproperties | |
| DOI | https://doi.org/10.1209/epl/i2001-00519-4 | |
| Published online | 01 December 2003 | |
Superconducting energy gap distribution of 
investigated by
point-contact spectroscopy
1
Physikalisches Institut, Universität Karlsruhe -
D-76128 Karlsruhe, Germany
2
Forschungszentrum Karlsruhe, Institut für Festkörperphysik
D-76021 Karlsruhe, Germany
Corresponding author: gernot.goll@phys.uni-karlsruhe.de
Received:
21
June
2001
Accepted:
20
July
2001
We performed point-contact spectroscopy on the binary superconductor
MgB2. The differential conductance shows gap-related structures which
vary in width and position from contact to contact. The distribution of energy
gaps shows a distinct
accumulation around 1.7 and 7 meV which is associated with the occurrence of
a small and a large energy gap in MgB2. While with increasing T
the structure in 
associated with the small gap is present up to 
,
in magnetic field it is suppressed well below 
.
PACS: 74.70.Ad – Metals; alloys and binary compounds (including A15, Laves phases, etc.) / 74.80.Fp – Point contacts; SN and SNS junctions / 74.20.Rp – Pairing symmetries (other than s-wave)
© EDP Sciences, 2001
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