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

Research output: Contribution to journalArticlepeer-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 languageEnglish (US)
Pages (from-to)1809-1812
Number of pages4
JournalPhysical review letters
Volume77
Issue number9
DOIs
StatePublished - 1996

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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