Momentum-dependent charge transfer excitations in sr2cuo2cl2 - Angle resolved electron energy loss spectroscopy

Y. Y. Wang; F. C. Zhang; V. P. Dravid; K. K. Ng; M. V. Klein; S. E. Schnatterly; L. L. Miller

doi:10.1103/PhysRevLett.77.1809

Momentum-dependent charge transfer excitations in sr2cuo2cl2 - Angle resolved electron energy loss spectroscopy

Y. Y. Wang, F. C. Zhang, V. P. Dravid, K. K. Ng, M. V. Klein, S. E. Schnatterly, L. L. Miller

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

65 Scopus citations

Abstract

Electron-hole pair excitations in the insulating cuprates Sr₂CuO₂Cl₂ were investigated by angle-resolved electron energy loss spectroscopy. The optically allowed and optically forbidden transitions were observed to be strongly anisotropic in Cu - O₂ plane. The former show a large energy dispersion 1.5eV along [110], and the latter appear at a higher energy position (4.5eV) only along [100], but not along [110]. We interpret these results as transitions involving excitons. A small exciton model is examined to explain both the observed features.

Original language	English (US)
Pages (from-to)	1809-1812
Number of pages	4
Journal	Physical review letters
Volume	77
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.77.1809
State	Published - 1996

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Momentum-dependent charge transfer excitations in sr2cuo2cl2 - Angle resolved electron energy loss spectroscopy",

abstract = "Electron-hole pair excitations in the insulating cuprates Sr2CuO2Cl2 were investigated by angle-resolved electron energy loss spectroscopy. The optically allowed and optically forbidden transitions were observed to be strongly anisotropic in Cu - O2 plane. The former show a large energy dispersion 1.5eV along [110], and the latter appear at a higher energy position (4.5eV) only along [100], but not along [110]. We interpret these results as transitions involving excitons. A small exciton model is examined to explain both the observed features.",

author = "Wang, {Y. Y.} and Zhang, {F. C.} and Dravid, {V. P.} and Ng, {K. K.} and Klein, {M. V.} and Schnatterly, {S. E.} and Miller, {L. L.}",

year = "1996",

doi = "10.1103/PhysRevLett.77.1809",

language = "English (US)",

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pages = "1809--1812",

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T1 - Momentum-dependent charge transfer excitations in sr2cuo2cl2 - Angle resolved electron energy loss spectroscopy

AU - Wang, Y. Y.

AU - Zhang, F. C.

AU - Dravid, V. P.

AU - Ng, K. K.

AU - Klein, M. V.

AU - Schnatterly, S. E.

AU - Miller, L. L.

PY - 1996

Y1 - 1996

N2 - Electron-hole pair excitations in the insulating cuprates Sr2CuO2Cl2 were investigated by angle-resolved electron energy loss spectroscopy. The optically allowed and optically forbidden transitions were observed to be strongly anisotropic in Cu - O2 plane. The former show a large energy dispersion 1.5eV along [110], and the latter appear at a higher energy position (4.5eV) only along [100], but not along [110]. We interpret these results as transitions involving excitons. A small exciton model is examined to explain both the observed features.

AB - Electron-hole pair excitations in the insulating cuprates Sr2CuO2Cl2 were investigated by angle-resolved electron energy loss spectroscopy. The optically allowed and optically forbidden transitions were observed to be strongly anisotropic in Cu - O2 plane. The former show a large energy dispersion 1.5eV along [110], and the latter appear at a higher energy position (4.5eV) only along [100], but not along [110]. We interpret these results as transitions involving excitons. A small exciton model is examined to explain both the observed features.

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JO - Physical Review Letters

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