Critical current, magnetic irreversibility line, and relaxation in electron irradiated single crystals of BaO · 6 KO · 4 BiO3

Autor: S. N. Shiraev, S. L. Kurochkin, L. A. Kurochkin, G. V. Gatalskii, V. I. Gatalskaya
Rok vydání: 1994
Předmět:
Zdroj: Physica Status Solidi (a). 143:123-129
ISSN: 1521-396X
0031-8965
DOI: 10.1002/pssa.2211430116
Popis: Measurements of remanent magnetization versus temperature, field, and time are performed on a single crystal of BKBO irradiated by fast electrons, in the temperature range from 4.2 to 25 K and in a field up to 6 T. It is shown that the critical current density under irradiation by a fluence of 1018 electrons/cm2 is enhanced by more than 2.5 times and amounts to 1.1 × 105 A cm−2 at 4.2 K in zero magnetic field. The irreversibility line shifts to higher magnetic fields. The lower critical field Hc1 and the flux entry field He increase, though the character of their dependences is kept. The pinning potential rises, increasing monotonously from 50 meV (4.2 K) to 80 meV (25 K). The results can be accounted for by stronger pinning of the vortex lattice in the BKBO single crystal with radiation defects. [Russian Text Ignored]
Databáze: OpenAIRE
Externí odkaz: