| Issue |
Europhys. Lett.
Volume 50, Number 3, May I 2000
|
|
|---|---|---|
| Page(s) | 368 - 374 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00280-2 | |
| Published online | 01 September 2002 | |
Instabilities at [110] surfaces of 
superconductors
1
Theoretische Physik,
ETH-Hönggerberg - CH-8093 Zürich, Switzerland
2
Yukawa Institute for Theoretical Physics, Kyoto University -
Kyoto 606-8502, Japan
Received:
18
May
1999
Accepted:
16
February
2000
We compare different possible origins for the low-temperature
splitting of the zero-energy peak in the local density of states at
(110) surfaces of -wave superconductors.
Using a tight-binding model with interactions in the
Bogolyubov-de Gennes treatment, we discuss the instability of the
superconductor against a current-carrying locally time-reversal symmetry-breaking
phase ( s+id -wave) and, alternatively, a spin density wave-like
state. The former (latter) is more likely to occur in a regime
corresponding to the overdoped (underdoped) situation of
high-temperture superconductors.
PACS: 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 75.30.Pd – Surface magnetism / 74.72.Bk – Y-based cuprates
© EDP Sciences, 2000
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