Occurrence of van Hove singularities in YBa2Cu4O8 and YBa2Cu3O6.9

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

doi:10.1016/0022-3697(93)90165-N

Occurrence of van Hove singularities in YBa₂Cu₄O₈ and YBa₂Cu₃O_6.9

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

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Abstract

We report seeing a saddle point in the energy band, known as a van Hove singularity. We measure an exact position of the singularity in both YBa₂Cu₄O₈(Y124) and YBa₂Cu₃O_6.9(Y123). In Y123 the van Hove singularity is at binding energy of less then 10 meV, closer ot E_F, than in Y124, which has a singularity at 19 meV. The singularity has and extended character along the Γ-Y direction. Another clearly resolved band exhibits a saddle point singularity at binding energy of 115 meV. Similar singularities are observed in the vicinity of the X point, extended along the Γ-X direction. In order to study these features the energy resolution of the system was improved to better than 10 me V.

Original language	English
Pages (from-to)	1193-1198
Number of pages	6
Journal	Journal of Physics and Chemistry of Solids
Volume	54
Issue number	10
DOIs	https://doi.org/10.1016/0022-3697(93)90165-N
State	Published - Oct 1993
Externally published	Yes

Keywords

ARPES
Fermi surface
high T superconductors
photoemission
van Hove singularities

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title = "Occurrence of van Hove singularities in YBa2Cu4O8 and YBa2Cu3O6.9",

abstract = "We report seeing a saddle point in the energy band, known as a van Hove singularity. We measure an exact position of the singularity in both YBa2Cu4O8(Y124) and YBa2Cu3O6.9(Y123). In Y123 the van Hove singularity is at binding energy of less then 10 meV, closer ot EF, than in Y124, which has a singularity at 19 meV. The singularity has and extended character along the Γ-Y direction. Another clearly resolved band exhibits a saddle point singularity at binding energy of 115 meV. Similar singularities are observed in the vicinity of the X point, extended along the Γ-X direction. In order to study these features the energy resolution of the system was improved to better than 10 me V.",

keywords = "ARPES, Fermi surface, high T superconductors, photoemission, van Hove singularities",

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

year = "1993",

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doi = "10.1016/0022-3697(93)90165-N",

language = "English",

volume = "54",

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TY - JOUR

T1 - Occurrence of van Hove singularities in YBa2Cu4O8 and YBa2Cu3O6.9

AU - Gofron, K.

AU - Campuzano, J. C.

AU - Ding, H.

AU - Gu, C.

AU - Liu, R.

AU - Dabrowski, B.

AU - Veal, B. W.

AU - Cramer, W.

AU - Jennings, G.

PY - 1993/10

Y1 - 1993/10

N2 - We report seeing a saddle point in the energy band, known as a van Hove singularity. We measure an exact position of the singularity in both YBa2Cu4O8(Y124) and YBa2Cu3O6.9(Y123). In Y123 the van Hove singularity is at binding energy of less then 10 meV, closer ot EF, than in Y124, which has a singularity at 19 meV. The singularity has and extended character along the Γ-Y direction. Another clearly resolved band exhibits a saddle point singularity at binding energy of 115 meV. Similar singularities are observed in the vicinity of the X point, extended along the Γ-X direction. In order to study these features the energy resolution of the system was improved to better than 10 me V.

AB - We report seeing a saddle point in the energy band, known as a van Hove singularity. We measure an exact position of the singularity in both YBa2Cu4O8(Y124) and YBa2Cu3O6.9(Y123). In Y123 the van Hove singularity is at binding energy of less then 10 meV, closer ot EF, than in Y124, which has a singularity at 19 meV. The singularity has and extended character along the Γ-Y direction. Another clearly resolved band exhibits a saddle point singularity at binding energy of 115 meV. Similar singularities are observed in the vicinity of the X point, extended along the Γ-X direction. In order to study these features the energy resolution of the system was improved to better than 10 me V.

KW - ARPES

KW - Fermi surface

KW - high T superconductors

KW - photoemission

KW - van Hove singularities

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U2 - 10.1016/0022-3697(93)90165-N

DO - 10.1016/0022-3697(93)90165-N

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SN - 0022-3697

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JF - Journal of Physics and Chemistry of Solids

IS - 10

ER -

Occurrence of van Hove singularities in YBa₂Cu₄O₈ and YBa₂Cu₃O_6.9

Abstract

Keywords

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