Abstract
Infrared measurements in superconductors offer the opportunity to study the superconducting energy gap, the dynamics of the conduction electrons, and the nature of low-energy excitations in the material. The infrared transmittance of single crystals of Bi2Sr2CaCu2O8 has been measured and the optical properties determined by Kramers-Kronig analysis. The normal-state data are compared to both one- and two-component descriptions of the optical conductivity. Both approaches allow for a qualitative description of the T-dependent far-infrared conductivity and the nearly T-independent midinfrared conductivity. Below T c the samples show almost zero absorption at low frequencies, with an onset around 150 cm-1. At higher frequencies, there is a characteristic maximum in the transmittance at ~ 700 cm-1 and corresponding structure in σ 1(ω). Although these features are revealed clearly below T c , we conclude that neither should be assigned to the superconducting gap.
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Tanner, D.B. et al. (1991). Infrared Studies of High-T c Superconductors: Where’s the Gap?. In: Ashkenazi, J., Barnes, S.E., Zuo, F., Vezzoli, G.C., Klein, B.M. (eds) High-Temperature Superconductivity. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3338-2_19
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