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Title: Magnetic-flux quanta in superconducting thin films observed by electron holography and digital phase analysis

Abstract

Singly quantized magnetic fluxes in superconducting lead films have been directly observed in the form of magnetic-flux-line distributions by using an electron-holography technique. Combining this with the digital-phase-analysis method, we were able to determine the flux quantum {ital h}/2{ital e} for individual fluxes with a precision of {similar to}{ital h}/100{ital e}, and analyze the distributions of field-vector components around the fluxon centers. The internal-field distributions obtained were compared with those calculated from the Ginzburg-Landau equations with use of some models, and an overall agreement was found between them. We also observed the changes of the magnetic-flux structures of lead thin films as a function of their thickness. Fluxon pairs were observed in 0.2-{mu}m-thick films, which may correspond to those suggested by Kosterlitz-Thouless theory.

Authors:
; ; ; ; ; ; ;  [1];  [2]
  1. Advanced Research Laboratory, Hitachi, Ltd., Hatoyama, Saitama 350-03, Japan (JP)
  2. Department of Electrical Engineering, Faculty of Engineering, Osaka University, Yamadaoka, Suita 565, (Japan)
Publication Date:
OSTI Identifier:
5625282
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter; (USA)
Additional Journal Information:
Journal Volume: 43:10; Journal ID: ISSN 0163-1829
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LEAD; SUPERCONDUCTIVITY; SUPERCONDUCTING FILMS; MAGNETIC FLUX; FLUX QUANTIZATION; HOLOGRAPHY; TYPE-I SUPERCONDUCTORS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ELEMENTS; FILMS; METALS; PHYSICAL PROPERTIES; SUPERCONDUCTORS; 360104* - Metals & Alloys- Physical Properties

Citation Formats

Hasegawa, S, Matsuda, T, Endo, J, Osakabe, N, Igarashi, M, Kobayashi, T, Naito, M, Tonomura, A, and Aoki, R. Magnetic-flux quanta in superconducting thin films observed by electron holography and digital phase analysis. United States: N. p., 1991. Web. doi:10.1103/PhysRevB.43.7631.
Hasegawa, S, Matsuda, T, Endo, J, Osakabe, N, Igarashi, M, Kobayashi, T, Naito, M, Tonomura, A, & Aoki, R. Magnetic-flux quanta in superconducting thin films observed by electron holography and digital phase analysis. United States. doi:10.1103/PhysRevB.43.7631.
Hasegawa, S, Matsuda, T, Endo, J, Osakabe, N, Igarashi, M, Kobayashi, T, Naito, M, Tonomura, A, and Aoki, R. Mon . "Magnetic-flux quanta in superconducting thin films observed by electron holography and digital phase analysis". United States. doi:10.1103/PhysRevB.43.7631.
@article{osti_5625282,
title = {Magnetic-flux quanta in superconducting thin films observed by electron holography and digital phase analysis},
author = {Hasegawa, S and Matsuda, T and Endo, J and Osakabe, N and Igarashi, M and Kobayashi, T and Naito, M and Tonomura, A and Aoki, R},
abstractNote = {Singly quantized magnetic fluxes in superconducting lead films have been directly observed in the form of magnetic-flux-line distributions by using an electron-holography technique. Combining this with the digital-phase-analysis method, we were able to determine the flux quantum {ital h}/2{ital e} for individual fluxes with a precision of {similar to}{ital h}/100{ital e}, and analyze the distributions of field-vector components around the fluxon centers. The internal-field distributions obtained were compared with those calculated from the Ginzburg-Landau equations with use of some models, and an overall agreement was found between them. We also observed the changes of the magnetic-flux structures of lead thin films as a function of their thickness. Fluxon pairs were observed in 0.2-{mu}m-thick films, which may correspond to those suggested by Kosterlitz-Thouless theory.},
doi = {10.1103/PhysRevB.43.7631},
journal = {Physical Review, B: Condensed Matter; (USA)},
issn = {0163-1829},
number = ,
volume = 43:10,
place = {United States},
year = {1991},
month = {4}
}