Mid-infrared excitations in undoped layered copper oxides

J. D. Perkins, J. M. Graybeal, M. A. Kastner, R. J. Birgeneau, J. P. Falck, Martin Greven

Research output: Contribution to journalArticlepeer-review

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Abstract

Optical absorption spectra are presented for four undoped single-crystal copper oxides: La2CuO4, Nd2CuO4, Pr2CuO4 and Sr2CuO2Cl2. Common absorption features are observed near 0.5 eV, which are shown from polarization measurements to be weakly electric-dipole allowed excitations of the CuO2 layers. The detailed polarization and spectral dependencies are consistent with normally forbidden valence-conserving crystal-field transitions with multi-magnon and phonon sidebands. Such transitions provide a natural origin for the mid-infrared band observed in doped copper oxides.

Original languageEnglish (US)
Pages (from-to)1533-1534
Number of pages2
JournalPhysica B: Physics of Condensed Matter
Volume194-196
Issue numberPART 2
DOIs
StatePublished - Feb 2 1994
Externally publishedYes

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