Abstract
Recent infrared reflectance spectroscopy on high quality crystals of a number of HTSC systems shows thatall have finite conductivity in the frequency region of the superconducting gap. Results on untwinned YBCO from a number of laboratories show that this absorption is not due to experimental problems or sample-to-sample variations. Other materials also show absorption features in the gap region in the form of peaks. We discuss these results in terms of recent ideas of the effect of impurities in d-wave superconductors.
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Timusk, T., Basov, D.N., Homes, C.C. et al. Gap states in HTSC by infrared spectroscopy. J Supercond 8, 437–440 (1995). https://doi.org/10.1007/BF00722824
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DOI: https://doi.org/10.1007/BF00722824