Vortex kinks and anysotropic superconductor magnetization curve

✍ Scribed by Vladimir N. Zavaritsky; Nicolay V. Zavaritsky

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 310 KB
• Volume: 185-189
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(91)91060-h

✦ Synopsis

The magnetization cloves of the Bi~Sr2CaCu~O~ and YBa2Cu30, single crystals are studied in the whole range of angles between the applied field and (ab)-plane of the crystal at T=(20 + 86)K. The M(H)-curves for the tilt angles are exhibit three distinct peculiarities, corresponded to the penetration of the flux fines along and perpendicular to the Cu-O layers. The latter is originated from the vortex kinks formation; its value is strongly depend on the tilt angle. The crucial role of the anisotropy for this effect observation is confirmed.

Layered structure of high-Te superconductors results in the pronounced anisotropy of their superconducting parameters. The effective mass ratios being ,~ 25 for Y1Ba2CusOr achieved values as large as ~ 4000 for Bi2Sr2C, aCu20s (Bi-2212). The important characteristic of layered superconductors is the d/~¢ ratio, where ~¢ is the coherence length along the c-axis direction and d is interlayer distance. The layered superconductor can be considered as being spatially homogeneous with the Abrikosov vortices lattice consisted of a periodically spaced straight lines in the case of small value of this ratio. In the opposite case of a well-pronounced