The midinfrared conductivity determined from the infrared reflectance of YBa2(Cu1−xNix)3O7−δ films

✍ Scribed by Jin-Tae Kim; Eric R. Ulm; Thomas R. Lemberger

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 134 KB
• Volume: 194-196
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(94)91267-x

✦ Synopsis

We present the midinfrared conductivity of a YBa2(Cu0.94Ni0.0~)s O7.~ film determined from fitting the measured infrared reflectance with a two-component model. To a first approximation, the "best-fit" midinfrared band conductivity is independent of T, in agreement with the midinfrared band used previously to fit the reflectances of films with _< 4% Ni. For the best fits, the midinfrared band at 10K and 100K has a well defined maximum at 300 cm ~. This feature disappears at 300K and its spectral weight is redistributed up to about 1000cm ~. Above about 1000cm -~, the midinfrared band is independent of temperature.