Photoresponse of epitaxial YBa2Cu3O7−x ultrathin films

✍ Scribed by A.P. Zhuravel; A.G. Sivakov; O.G. Turutanov; I.M. Dmitrenko; K. Joosse; G.J. Gerritsma; H. Rogalla

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 675 KB
• Volume: 34
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(05)80206-1

✦ Synopsis

The voltage photoresponse of YBa2CH307_ x/SrTiO3 10 nm-tlfick films on laser irradiation is studied using the low temperature scanning laser microscopy (LTSLM) teclmique. The irradiation wavelength is 633 run. The spatial response dependencies via temperature (4-100 K), beam intensity modulation frequency (0-150 kHz) and bias current are examined. The bolometric and non-bolometric components are separated. The amplitude of the non-bolometric component at 4.2 K is about 10 times higher than that of bolometric one measured near the midpoint of the superconducting transition. The non-bolometric component is presumably associated with weak links in the film due to interdiffusion of SrTiO3 into YBCO layer. The spatial irregularity in superconducting parameters is not resolved by the LTSLM method since the spacing between weak links is appeared to be less than 1 gin.