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Mid-infrared absorption in YBa2Cu3O6: Failure of spin-wave theory in undoped cuprates?

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arxiv cond-mat/9904394 v1 pith:JYIVOZQ2 submitted 1999-04-27 cond-mat.str-el cond-mat.supr-con

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 This is my paper
classification cond-mat.str-el cond-mat.supr-con
keywords absorptionfailurelineshapemid-infraredspectralspin-wavetheoryundoped
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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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