Far-infrared and mid-infrared absorption in (Bi,Pb)-Sr-(Ca,Y)-Cu-O |
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| Authors: | P Calvani M Capizzi P Dore S Lupi P Maselli G Paleologo G Balestrino M Marinelli E Milani H Berger P Roy and Y -L Mathis |
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| Institution: | (1) Dipartimento di Fisica, Universitá di Roma La Sapienza, P.leA. Moro, 2-00185 Roma, Italy;(2) Dipartimento di Ingegneria Meccanica, Università di Tor Vergata, V.O. Raimondo, 8-00173 Roma, Italy;(3) Institut de Physique Appliquée Ecole Politechnique Federale, PH Ecublens, CH-1015 Lausanne, Switzerland;(4) LURE-Université Paris-Sud, 91405 Orsay, France |
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| Abstract: | The reflectivities of seven films belonging to the Bi-Sr-Ca-Cu-O family, with Tc ranging from 60 to 95 K, and of a single crystal of insulating Bi-Sr-Y-Cu-O, have been measured at room temperature in the normal phase. The optical conductivity has been analyzed in terms of Drude (D), mid-infrared (MIR), and charge-transfer (CT) contributions. As Tc increases, the spectral weight within the charge-transfer gap (D+MIR) increases. Meanwhile, the peak frequency of the MIR band moves towards the far-infrared and the optical conductivity becomes more similar to that of a  normal metal. |
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