Photoresponse of epitaxial YBa2Cu3O7-x ultrathin films


Zhuravel, A.P. and Sivakov, A.G. and Turutanov, O.G. and Dmitrenko, I.M. and Joosse, K. and Gerritsma, G.J. and Rogalla, H. (1994) Photoresponse of epitaxial YBa2Cu3O7-x ultrathin films. Cryogenics, 34 (Suppl.). pp. 875-878. ISSN 0011-2275

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Abstract: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 um.
Item Type:Article
Copyright:© 1994 Elsevier Science
Science and Technology (TNW)
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