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Angular dependence of critical magnetic fields in superconducting films
Author(s) -
Krätzig E.,
Keller J.
Publication year - 1970
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19700420227
Subject(s) - superconductivity , penetration depth , condensed matter physics , magnetic field , superconducting coherence length , critical field , coherence length , ginzburg–landau theory , london penetration depth , interpolation (computer graphics) , materials science , thin film , phase transition , attenuation , physics , optics , quantum mechanics , nanotechnology , classical mechanics , motion (physics)
The angular dependence of the critical magnetic field H c in superconducting films is studied by measuring the attenuation of ultrasonic surface waves. In the case of thin films (phase transitions of second order) good agreement with an interpolation formula derived by Tinkham [1] is found. Thick films (film thickness large compared to coherence length and penetration depth) are studied too showing first order phase transitions or surface superconductivity in a magnetic field parallel to the film. In the case of surface superconductivity the measurements are compared with a new interpolation formula for H c which can be derived from the Ginzburg‐Landau equation.