Mid-infrared absorption in YBa2Cu3O6: Failure of spin-wave theory in undoped cuprates?
M. Grueninger, D. van der Marel, A. Damascelli, A. Erb, Th. Wolf, T. Nunner, T. Kopp
Abstract
The optical conductivity sigma (omega) of undoped YBa2Cu3O6 is studied in detail in the mid-infrared range. Substitutions on all but the Ba site are used to identify the prominent absorption processes at 2800 and 3800 cm-1. Experimental evidence for bimagnon-plus-phonon absorption is collected. A more critical analysis of the lineshape and the spectral weight reveals the limits of this approach. Although phonon-2-magnon multiple scattering seems to reproduce the lineshape, the necessary coupling is unrealistically large. The strong increase of high frequency spectral weight with increasing temperature makes the failure of spin-wave theory even more evident.
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