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10 June 1996 Unconventional electrodynamics of high-Tc and organic superconductors
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The combination of lowered dimensionality and electron-electron correlations are responsible for the unusual temperature and frequency dependence of the electrical conductivity of the new superconductors. We first review the electrodynamics of two systems, U2Ru2Si2 and Sr2RuO4 where conventional Fermi liquid ideas seem to work. Here transport is by free carriers with strongly renormalized masses. On the other hand the electrodynamics of the high Tc cuprates and the organic charge transfer salts is unconventional. The high Tcs show a Drude peak with an anomalous temperature and frequency dependent scattering rate for the in-plane conductivity, while normal to the planes they are almost insulating. In the organics, the transport currents are carried by a narrow collective mode coupled to phonons.
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Thomas Timusk, N. Cao, D. N. Basov, and Christopher C. Homes "Unconventional electrodynamics of high-Tc and organic superconductors", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996);

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