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Temperature dependence of microwave losses in Y-Ba-Cu-O films (1990)

Pakulis, E. J. ; Sandstrom, R. L. ; Chaudhari, P. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 57 (1990), S. 940-942

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: We have made measurements of the T dependence of microwave absorption (at 22.7 GHz) in films of Y1Ba2Cu3Ox on SrTiO3 and LaGaO3 substrates. The superconducting transition temperatures were near 90 K. The film on SrTiO3 had predominantly c axis normal to the film, while the film on LaGaO3 was partially a axis oriented. The microwave losses L for both films followed the temperature dependence given by L∝t/(square root of)1−t, with t=T/Tc. In the macroscopic theory of Ginzburg–Landau, this expression is proportional to the number of normal electrons within a penetration depth of the surface of the film, provided (1−t)(very-much-less-than)1. However, we find that the above expression fits the data well for a wide range of T.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.104273

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