Springer Online Journal Archives 1860-2000
Electrical Engineering, Measurement and Control Technology
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−δ, 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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