Asymmetric d-wave superconducting gap in orthorhombic high-Tc superconductors

Xiao-Shan Ye; Jian-Xin Li

doi:10.1103/PhysRevB.76.174503

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Asymmetric d-wave superconducting gap in orthorhombic high-Tc superconductors

Xiao-Shan Ye, Jian-Xin Li

DOI 10.1103/PhysRevB.76.174503 · Physical Review B

T1

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Abstract

Based on a random-phase approximation, we study the superconducting (SC) gap in orthorhombic high-Tc cuprates by considering the anisotropic hopping (tx,ty) along two lattice directions. With tx∕ty>1, it is found that the SC gap shows an obvious anisotropy with ∣Δ(0,π)∣>∣Δ(π,0)∣, and the gap node deviates from the diagonal direction toward the kx direction. This is consistent with the recent experiments. However, we find a perplexity for consistent explaining the anisotropy in the SC gap and spin fluctuations if only the anisotropic hopping integral is considered. We show that a possible solution to this difficulty is to include the coupling between the plane and chain, in addition to the effect of the anisotropic energy band.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown