Physics – Condensed Matter – Superconductivity
Scientific paper
1995-07-02
Phys. Rev. B 53, 12311 (1996)
Physics
Condensed Matter
Superconductivity
7 pages, ReVTeX, 2 figures attached as postscript files
Scientific paper
10.1103/PhysRevB.53.12311
We consider the flux jump instability of the Bean's critical state arising in the flux creep regime in type-II superconductors. We find the flux jump field, $B_j$, that determines the superconducting state stability criterion. We calculate the dependence of $B_j$ on the external magnetic field ramp rate, $\dot B_e$. We demonstrate that under the conditions typical for most of the magnetization experiments the slope of the current-voltage curve in the flux creep regime determines the stability of the Bean's critical state, {\it i.e.}, the value of $B_j$. We show that a flux jump can be preceded by the magneto-thermal oscillations and find the frequency of these oscillations as a function of $\dot B_e$.
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