Evidence for k-dependent, in-plane anisotropy of the superconducting gap in Bi2Sr2CaCu2O8+δ

B. O. Wells; Z. X. Shen; D. S. Dessau; W. E. Spicer; D. B. Mitzi; L. Lombardo; A. Kapitulnik; A. J. Arko

doi:10.1103/PhysRevB.46.11830

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Evidence for k-dependent, in-plane anisotropy of the superconducting gap in Bi2Sr2CaCu2O8+δ

B. O. Wells, Z. X. Shen, D. S. Dessau, W. E. Spicer, D. B. Mitzi, L. Lombardo, A. Kapitulnik, A. J. Arko

DOI 10.1103/PhysRevB.46.11830 · Physical Review B

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Abstract

We find the superconducting gap in Bi2Sr2CaCu2O8+δ single crystals is anisotropic in k space by roughly a factor of 2 using angle-resolved photoemission spectroscopy. Matching the k-space symmetry of the gap values provides a stringent constraint on theories of the mechanism of high-temperature superconductivity. A review of the literature shows that many puzzling results can be explained by anisotropic gaps in the high-Tc cuprates.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91	Pressure not reported	onset
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	78	Pressure not reported	onset