Manifestation of a superconducting gap in the optical absorption of superconductors YBa2Cu3O7–<i>δ</i> and Bi2Sr2CaCu2O8 in the visible spectral range
I. Ya. Fugol’B. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, KharkovV. N. SamovarovB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, KharkovA. M. RatnerB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, KharkovV. M. ZhuravlevB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, KharkovG. Saemann-lschenkoPhysical Institute, Erlangen University, Erlangen, GermanyM. LippertPhysical Institute, Erlangen University, Erlangen, GermanyB. HolzäpfelSiemens A. G. Research Center, Erlangen, GermanyOliver Mayer
ABI
Annotatsiya
The manifestation of a superconducting gap was observed experimentally in the temperature dependence of the absorption coefficient κ at a frequency fixed in the interval 1.5–3.0 eV. The temperature dependence of κ has a kink at the point Tc: above Tc, it displays a linear dependence, while below Tc it has a singularity mainly repeating the temperature dependence of the gap. The observed effects are of an equilibrium nature and are interpreted in terms of equilibrium electron characteristics.
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