Vortex behavior in a rotated YBa2Cu3O7-δ polycrystal

I. M. Obaidat, S. J. Park, J. S. Kouvel

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Magnetic measurements on a rotated polycrystalline YBa2Cu3O7-δ (YBCO) disk at 4.2 K yield polar plots of the longitudinal-vs.-transverse components of the vortex flux density (B) relative to the fixed applied field (H) for various angles of rotation (θ) up to 360°. For the sample initially in a field-cooled (FC) state, detailed analyses of these plots reveal that B at any θ consists of a BR component, which rotates rigidly with the sample, plus a BF component, which stays at a constant frictional angle relative to H. At each H, BR and BF undergo large characteristic changes with θ until a rotational steady state is reached for θ above 180°. Strikingly, their numerical sum BR + BF is constant for θ up to ∼ 90°, then decreases linearly up to ∼ 180°, above which it remains constant at its reduced value. This reduction in BR + BF is attributed to an exiting of vortices from the sample, primarily those associated with the weakly pinned BF component. With increasing H, the relative vortex reduction rises to a broad maximum (of nearly 40%) and then slowly decreases, which reflects a competition between the intervortex repulsion and the confining forces produced by H. For the sample initially in a zero-field-cooled (ZFC) state, BR goes to zero while BF reaches the same steady-state value as in the corresponding FC case but without any vortex exiting from the sample.

Original languageEnglish
Pages (from-to)185-190
Number of pages6
JournalPhysica C: Superconductivity and its applications
Issue number3-4
Publication statusPublished - Nov 20 1998
Externally publishedYes


  • Polycrystal
  • Vortex
  • YBaCuO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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