Anisotropy and oxygen-stoichiometry dependence of the dielectric tensor of YBa2Cu3O7-δ (0≤δ≤1)

J. Kircher, M. K. Kelly, Sergey Rashkeev, M. Alouani, D. Fuchs, M. Cardona

Research output: Contribution to journalArticle

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Abstract

The dielectric tensor elements of oriented YBa2Cu3O7-δ samples, as obtained by spectroscopic ellipsometry, are presented for several oxygen stoichiometries in the photon energy range between 1.66 and 5.5 eV. For δ=0 and 1, we extend this range up to 9.5 eV using a recently developed synchrotron radiation ellipsometer. We compare the experimental results with computed values for the dielectric function obtained from a linear-muffin-tin- orbitals band-structure calculation. We find good general agreement for both the orientational and compositional dependence. In particular, both experiment and theory show c polarization for a peak near 2.7 eV for δ<0.5, while a transition in that spectral region is a polarized for YBa2Cu3O6. In spite of the difficulty in predicting insulating behavior of the low-oxygen material, these results show that the local-density-approximation picture is successful in describing much of the electronic structure determining higher-energy excitations. In addition, the measured dependence of the dielectric tensor on the oxygen stoiochiometry provides a reference for optical determination of the oxygen content and orientation in applications, such as thin-film or single-crystal growth.

Original languageEnglish
Pages (from-to)217-224
Number of pages8
JournalPhysical Review B
Volume44
Issue number1
DOIs
Publication statusPublished - 1 Dec 1991
Externally publishedYes

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Stoichiometry
Tensors
stoichiometry
Anisotropy
tensors
Oxygen
anisotropy
oxygen
Local density approximation
ellipsometers
Spectroscopic ellipsometry
Tin
Excitation energy
Crystallization
Synchrotron radiation
Crystal growth
Crystal orientation
Band structure
ellipsometry
Electronic structure

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Anisotropy and oxygen-stoichiometry dependence of the dielectric tensor of YBa2Cu3O7-δ (0≤δ≤1). / Kircher, J.; Kelly, M. K.; Rashkeev, Sergey; Alouani, M.; Fuchs, D.; Cardona, M.

In: Physical Review B, Vol. 44, No. 1, 01.12.1991, p. 217-224.

Research output: Contribution to journalArticle

Kircher, J. ; Kelly, M. K. ; Rashkeev, Sergey ; Alouani, M. ; Fuchs, D. ; Cardona, M. / Anisotropy and oxygen-stoichiometry dependence of the dielectric tensor of YBa2Cu3O7-δ (0≤δ≤1). In: Physical Review B. 1991 ; Vol. 44, No. 1. pp. 217-224.
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