Theab-plane optical conductivity of high-Tc superconductors |
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Authors: | D B Tanner M A Quijada D N Basov T Timusk R J Kelley M Onellion B Dabrowski J P Rice and D M Ginsberg |
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Affiliation: | (1) Dept. Physics, University of Florida, 32611 Gainesville, FL;(2) Dept. Physics and Astronomy, McMaster University, L8S 4M1 Hamilton, Ontario, Canada;(3) Dept. Physics, University of Wisconsin, 53706 Madison, WI;(4) Physics Dept., Northern Illinois University, 60115 DeKalb, IL;(5) Dept. Physics, University of Illinois, 61801 Urbana, IL |
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Abstract: | There is anisotropy in theab-plane optical properties of the high-temperature superconductors, both in the normal state and in the superconducting state. In both states, two components appear in the optical conductivity: a free carrier part and a midinfrared component. BelowT
c
, the free carriers form the superconducting condensate. In YBa2Cu3O7–, the anisotropy of the penetration depth shows that the chains contribute strongly to this superfluid. In Bi2Sr2CaCu2O8, where chains are absent, there is stillab plane anisotropy. BelowT
c
a finite absorption parallelb remains at frequencies as small as 20 meV. This anisotropy could be due to anisotropy either of the superconducting gap or the midinfrared component. |
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Keywords: | Superconductors optical properties High-T
c
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