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10 June 1996 Optical studies of magnons, excitons, and polarons in CuO2-layer compounds
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The optical properties of undoped and lightly doped lamellar copper oxides are reviewed. In the undoped materials the absorption below the charge-transfer gap is dominated by magnetic and crystal field excitations of the CuO2 layers. The temperature dependence of the charge-transfer absorption provides evidence that free charged excitations form large polarons. However, the optical ionization energy of holes bound to acceptors is much larger than the thermal ionization energy, indicating that the bound polarons are small. The parameters extracted from optical measurements predict the Hall mobility of holes in lightly doped La2CuO4, with no adjustable parameters, confirming that the carriers are polarons.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Marc A. Kastner and Robert J. Birgeneau "Optical studies of magnons, excitons, and polarons in CuO2-layer compounds", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996);

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