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Flux pinning in thermodynamically reversible type II superconductors

✍ Scribed by E.L. Andronikashvili; J.G. Chivinadze; R.M. Kerr; J. Lowell; K. Mendelssohn; J.S. Tsakadze

Publisher: Elsevier Science
Year: 1969
Tongue: English
Weight: 143 KB
Volume: 9
Category: Article
ISSN: 0011-2275
DOI: 10.1016/0011-2275(69)90191-x

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✦ Synopsis

A PREVIOUS paper I it was reported that in wires of type II superconductors strong additional damping of torsional oscillations is observed in the range He1 < H< He2 which is caused by the pinning of Abrikosov flux lines on inhomogeneities of the crystal lattice. The present paper describes pinning studies on single crystal specimens, the near perfect state of which is evidenced by the reversibility of the magnetization curve, as shown in Figure . The single crystal of Ta7oNb3o was grown at the Clarendon Laboratory where its composition and magnetic characteristics were determined. The actual pinning observations were carried out at the Academy Institute of Physics in Tbilissi.

From the original single crystal a specimen of 0-26 cm diameter and 1-05 cm length was prepared by spark cutting. The measurements were carried out in the cryostat in Figure . The specimen l, attached to a long glass rod 2, was suspended on the elastic thread 3 in the Dewar vessel. Two mirrors 4, 5 were attached below and

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