Flux dynamics and vortex phase diagram of the new superconductor $MgB_2$

Details Flux dynamics and vortex phase diagram of the new superconductor $MgB_2$ Flux dynamics and vortex phase diagram of the new superconductor $MgB_2$

2001-03-26

arxiv.org/abs/cond-mat/0103521v1

Physica C 363, 170(2001)

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

10.1016/S0921-4534(01)00936-4

Magnetic critical current density and relaxation rate have been measured on $MgB_2$ bulks from 1.6 K to $T_c$ at magnetic fields up to 8 Tesla. A vortex phase diagram is depicted based on these measurement. Two phase boundaries $H_{irr}^{bulk}(T)$ and $H_{irr}^{g}(T)$ characterizing different irreversible flux motions are found. The $H_{irr}^{bulk}(T)$ is characterized by the appearance of the linear resistivity and is attributed to quantum vortex melting induced by quantum fluctuation of vortices in the rather clean system. The second boundary $ H_{irr}^g(T) $ reflects the irreversible flux motion in some local regions due to either very strong pinning or the surface barrier on the tiny grains.

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