Gap anisotropy in Bi2Sr2CaCu2O8+δ by ultrahigh-resolution angle-resolved photoemission

Hong Ding; J. C. Campuzano; K. Gofron; C. Gu; R. Liu; B. W. Veal; G. Jennings

doi:10.1103/PhysRevB.50.1333

Gap anisotropy in Bi2Sr2CaCu2O8+δ by ultrahigh-resolution angle-resolved photoemission

Hong Ding, J. C. Campuzano, K. Gofron, C. Gu, R. Liu, B. W. Veal, G. Jennings

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Abstract

Ultrahigh-resolution (ΔE up to 10 meV) angle-resolved photoemission spectroscopy on single crystals of Bi2Sr2CaCu2O8+δ (Bi-2212) show a highly anisotropic superconducting energy gap: the gap is minimized, with a value close to zero, along the Γ-X and Γ-Y symmetry directions, while a large gap (Δ=22 meV) is observed along the Γ-M̄ (Cu-O bond) direction. However, the observation of gap anisotropy may depend on sample conditions; in a few cases the gap becomes more isotropic. A dip in the spectral weight at 65 meV below the Fermi energy is clearly observed only in samples with an anisotropic gap.

Original language	English
Pages (from-to)	1333-1336
Number of pages	4
Journal	Physical Review B
Volume	50
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.50.1333
State	Published - 1994
Externally published	Yes

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title = "Gap anisotropy in Bi2Sr2CaCu2O8+δ by ultrahigh-resolution angle-resolved photoemission",

abstract = "Ultrahigh-resolution (ΔE up to 10 meV) angle-resolved photoemission spectroscopy on single crystals of Bi2Sr2CaCu2O8+δ (Bi-2212) show a highly anisotropic superconducting energy gap: the gap is minimized, with a value close to zero, along the Γ-X and Γ-Y symmetry directions, while a large gap (Δ=22 meV) is observed along the Γ-{\=M} (Cu-O bond) direction. However, the observation of gap anisotropy may depend on sample conditions; in a few cases the gap becomes more isotropic. A dip in the spectral weight at 65 meV below the Fermi energy is clearly observed only in samples with an anisotropic gap.",

author = "Hong Ding and Campuzano, {J. C.} and K. Gofron and C. Gu and R. Liu and Veal, {B. W.} and G. Jennings",

year = "1994",

doi = "10.1103/PhysRevB.50.1333",

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T1 - Gap anisotropy in Bi2Sr2CaCu2O8+δ by ultrahigh-resolution angle-resolved photoemission

AU - Ding, Hong

AU - Campuzano, J. C.

AU - Gofron, K.

AU - Gu, C.

AU - Liu, R.

AU - Veal, B. W.

AU - Jennings, G.

PY - 1994

Y1 - 1994

N2 - Ultrahigh-resolution (ΔE up to 10 meV) angle-resolved photoemission spectroscopy on single crystals of Bi2Sr2CaCu2O8+δ (Bi-2212) show a highly anisotropic superconducting energy gap: the gap is minimized, with a value close to zero, along the Γ-X and Γ-Y symmetry directions, while a large gap (Δ=22 meV) is observed along the Γ-M̄ (Cu-O bond) direction. However, the observation of gap anisotropy may depend on sample conditions; in a few cases the gap becomes more isotropic. A dip in the spectral weight at 65 meV below the Fermi energy is clearly observed only in samples with an anisotropic gap.

AB - Ultrahigh-resolution (ΔE up to 10 meV) angle-resolved photoemission spectroscopy on single crystals of Bi2Sr2CaCu2O8+δ (Bi-2212) show a highly anisotropic superconducting energy gap: the gap is minimized, with a value close to zero, along the Γ-X and Γ-Y symmetry directions, while a large gap (Δ=22 meV) is observed along the Γ-M̄ (Cu-O bond) direction. However, the observation of gap anisotropy may depend on sample conditions; in a few cases the gap becomes more isotropic. A dip in the spectral weight at 65 meV below the Fermi energy is clearly observed only in samples with an anisotropic gap.

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DO - 10.1103/PhysRevB.50.1333

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Gap anisotropy in Bi2Sr2CaCu2O8+δ by ultrahigh-resolution angle-resolved photoemission

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