Far-infrared reflectivity of Bi_2Sr_2CuO_6: the "anomalous Drude" model and optical pseudogap revisited

Details Far-infrared reflectivity of Bi_2Sr_2CuO_6: the "anomalous Drude" model and optical pseudogap revisited Far-infrared reflectivity of Bi_2Sr_2CuO_6: the "anomalous Drude" model and optical pseudogap revisited

2000-01-18

arxiv.org/abs/cond-mat/0001244v2

Physics

Condensed Matter

Superconductivity

4 pages with 3 figs. Revised version. To appear on Phys. Rev. B, 1 Nov. 2000. Contact: paolo.calvani@roma1.infn.it

Scientific paper

An optical "pseudogap" is usually assumed to open at low T in the "anomalous Drude" absorption, which models the optical conductivity sigma(omega) (proportional to omega-1) of HCTS by a linewidth Gamma (on the order of 1000 cm-1) varying with omega. In the sigma(omega) of BSCO, measured down to 10 cm-1, we have resolved instead: i) a normal Drude term with Gamma=35 cm-1 at 30 K, in very good agreement with transport data; ii) a strong band peaked in the far infrared (FIR), likely due to bound charges, whose tail exhibits the omega-1 dependence. As the FIR peak softens for decreasing T, it opens a pseudogap-like depression in sigma(omega) accordingly to ordinary sum rules.

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