Infrared properties of YBa(2)Cu(3)O(7-delta)

Timusk, T. and Bonn, D. A. and Greedan, J. E. and Kamarás, Katalin (1988) Infrared properties of YBa(2)Cu(3)O(7-delta). PHYSICA C - SUPERCONDUCTIVITY AND ITS APPLICATIONS, 153 (Part 2). pp. 1744-1747. ISSN 0921-4534

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Abstract

We review recent experimental data on the infrared properties of YBa(2)Cu(3)O(7-delta) ceramics and single crystals. Kramers-Kronig analysis shows that the normal state far-infrared optical conductivity is dominated by a Drude response from free carriers with a plasma frequency of the order of 1.0 eV and a relaxation rate of .037 eV (300 cm (-1) ) at 100 K. A strong mid-infrared band centered between 0.2 and 0.5 eV is seen in all the samples. Below the superconducting transition temperature the far-infrared conductivity is depressed below 400 cm (-1) but this is not a true energy gap since there remains, even in the best oriented crystal samples, a residual absorption.

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