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

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.

preprint1999arXivOpen access
M. GrueningerD. van der MarelA. DamascelliA. ErbTh. WolfT. NunnerT. Kopp
cond-mat.supr-concond-mat.str-el
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M. GrueningerD. van der MarelA. DamascelliA. ErbTh. WolfT. NunnerT. Kopp

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