Extra-drude contribution to the far infrared conductivity oxygen deficient YBCO films |
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| Authors: | P Dore A Paolone S Tatoni C P Varsamis V Boffa C Romeo S Barbanera and F Murtas |
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| Institution: | (1) Dipartimento di Fisica, Universita di Roma  La Sapienza , Piazza A. Moro 2, 00185 Roma, Italy;(2) ENEA-CRE Frascati, Via E. Fermi 27, 00044 Frascati Roma, Italy;(3) CNR-IESS, Via Cineto Romano 42, Roma, Italy |
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| Abstract: | We measured reflectance spectra R(v) of oxygen deficient Y1Ba2Cu3O7–x (YBCO) films of different thickness, with critical temperatures between 85 and 87 K. Measurements were made at room temperature between 15 and 25000 cm–1. The measured R(v) have a maximum below 100 cm–1 and then decrease for v  0. This low frequency behaviour of R(v) can be accounted for by considering a relevant extra-Drude contribution to the far infrared optical conductivity of YBCO. |
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