Journal
EUROPHYSICS LETTERS
Volume 50, Issue 3, Pages 368-374Publisher
EDP SCIENCES S A
DOI: 10.1209/epl/i2000-00280-2
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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 d(x2-y2)-waw superconductors. Using a tight-binding model with interactions in the Bogolybov-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.
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