J. Phys. Soc. Jpn. 71, pp. 1840-1843 (2002) [4 Pages]
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LETTERS

Direct Evidence of the Anisotropic Structure of Vortices Interacting with Columnar Defects in High-Temperature Superconductors through the Analysis of Lorentz Images

Osamu Kamimura1,8, Hiroto Kasai1,8, Tetsuya Akashi2,8, Tsuyoshi Matsuda1,8, Ken Harada1,8, Jun Masuko3, Takaho Yoshida1,8, Nobuyuki Osakabe1,3, Akira Tonomura1,8, Marco Beleggia4, Giulio Pozzi4, Jun-ichi Shimoyama5,8, Kohji Kishio5,8, Tetsuo Hanaguri5,6,8, Koichi Kitazawa5,6,8, Masato Sasase7, and Satoru Okayasu7
+ Affiliations
1Advanced Research Laboratory, Hitachi, Ltd., Hatoyama, Saitama 350-03952Hitachi Instruments Service Co., Ltd., 4-28-8 Yotsuya, Shinjuku-ku, Tokyo 160-00043Department of Physics, Tokyo Institute of Technology, Ohokayama, Meguro-ku, Tokyo 152-85514Department of Physics and Istituto Nazionale per la Fisica della Materia, University of Bologna, Viale B. Pichat 6/2, 40127 Bologna, Italy5Department of Applied Chemistry, University of Tokyo, Tokyo 113-86566Department of Advanced Materials Science, School of Frontier Sciences, University of Tokyo, Tokyo 113-00337Department of Material Science, Japan Atomic Energy Research Institute, Tokai, Naka-gun, Ibaraki 319-11958SORST, Japan Science and Technology Corporation (JST), Nihonbashi, Chuo-ku, Tokyo 103-0027
Received February 8, 2002

Two types of Fresnel contrasts of superconducting vortices in a Lorentz micrograph, corresponding to pinned and unpinned vortices, were obtained by a newly developed 1 MV field-emission transmission electron microscope on a Bi 2 Sr 2 CaCu 2 O 8+δ (Bi-2212) thin specimen containing tilted linear columnar defects introduced by heavy ion irradiation. The main features of the Fresnel contrasts could be consistently interpreted by assuming that the vortices are pinned along the tilted columnar defects and by using a layered or an anisotropic model to calculate the phase shift of the electron wave. The confirmed validity of both models strongly indicates that superconducting vortices in high-critical temperature (high- T c ) layered materials have an anisotropic structure.

©2002 The Physical Society of Japan
https://doi.org/10.1143/JPSJ.71.1840
KEYWORDS: superconductor, anisotropy, layered structure, superconducting vortex, columnar defect, Lorentz microscopy, electron microscopy

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