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- Title
Pinning of spiral fluxons by giant screw dislocations in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7 − δ</sub> single crystals: Josephson analog of the fishtail effect.
- Authors
Sergeenkov, S.; Cichetto, Jr., L.; Rivera, V. A. G.; Stari, C.; Marega, E.; Cardoso, C. A.; Araujo-Moreira, F. M.
- Abstract
By using a highly sensitive homemade AC magnetic susceptibility technique, the magnetic flux penetration has been measured in YBa2Cu3O7 − δ single crystals with giant screw dislocations (having the structure of the Archimedean spirals) exhibiting a = 3 spiral turnings, the pitch b = 18.7 μm and the step height c = 1.2 nm (the last parameter is responsible for creation of extended weak-link structure around the giant defects). The magnetic field applied parallel to the surface enters winding around the weak-link regions of the screw in the form of the so-called spiral Josephson fluxons characterized by the temperature dependent pitch b f( T). For a given temperature, a stabilization of the fluxon structure occurs when b f( T) matches b (meaning an optimal pinning by the screw dislocations) and manifests itself as a pronounced low-field peak in the dependence of the susceptibility on magnetic field (applied normally to the surface) in the form resembling the high-field (Abrikosov) fishtail effect.
- Subjects
MAGNETIC susceptibility; MAGNETIC flux; CRYSTAL growth; DISLOCATIONS in crystals; MAGNETIC fields
- Publication
JETP Letters, 2010, Vol 91, Issue 1, p30
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S0021364010010078