Abstract
We used microwave self-resonant and magnetically modulated microwave absorption techniques to measure the London penetration depth, λ, and coherence length, ξ, in the direction parallel and perpendicular to the a-b plane of YBCO films. We found that both λ and ξ were anisotropic; it appeared that the value of λ∥ (0) was about 1800 Å and λ⊥(86.5) about 26 000 Å, where λ∥ is the penetration depth for the applied microwave electric field parallel and λ⊥ perpendicular to the film plane (c-axis is perpendicular to the film plane). We deduced ξ∥ to be equal to 129 Å and ξ⊥ 40 Å at 86.5 K. The anisotropy factor γ we determined to be about 3.
Keywords
magnetically modulated microwave absorption, London penetration depth, YBCO films, microwave self-resonant techniques
Subject Categories
Anisotropy
Disciplines
Electromagnetics and photonics
Publisher
American Institute of Physics
Publication Date
5-15-1993
Rights Information
Copyright 1993 American Institute of Physics.
Rights Holder
American Institute of Physics
Permanent URL
Recommended Citation
Jiang, H.; Yuan, T.; How, H.; Widom, A.; Vittoria, C.; and Drehman, A., "Measurements of anisotropic characteristic lengths in YBCO films at microwave-frequencies" (1993). Electrical and Computer Engineering Faculty Publications. Paper 82. http://hdl.handle.net/2047/d20002253
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Notes
Originally published in Journal of Applied Physics 73, 5865 (1993). DOI:10.1063/1.353554 (http://dx.doi.org/10.1063/1.353554).