Abstract
Recent measured bands in the mid IR of parent insulating compounds of cuprate superconductors [Perkins et al. Phys. Rev. Lett.71 1621 (1993)] are interpreted as multimagnon infrared (IR) absorption assisted by phonons. We present results for the coupling constant of light with this excitations and exact diagonalization results for the spectra and compare with interacting spin wave theory. The observed structures correspond to the absorption of one phonon plus two magnons and one phonon plus higher multimagnon absorption processes. Our results imply that IR absorption can be used as a unique probe of quantum antiferromagnetic systems.
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We acknowledge J. D. Perkins for many insights and Y. Otha for help with the exact diagonalization program. This investigation was supported by the Netherlands Foundation for Fundamental Research on Matter (FOM) with financial support from the Netherlands Organization for the Advance of Pure Research (NWO) and Stichting Nationale Computer Faciliteiten (NCF). Computations where perform at SARA (Amsterdam). J.L. and R.E. are supported by postdoctoral fellowships granted by the Commission of the European Communities.
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Lorenzana, J., Eder, R., Meinders, M. et al. Exact diagonalization results for multimagnon IR absorption in the cuprates. J Supercond 8, 567–570 (1995). https://doi.org/10.1007/BF00727427
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DOI: https://doi.org/10.1007/BF00727427