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- W1978997419 abstract "Magnetic relaxation, critical current density and transport properties have been investigated on MgB2 bulks from 1.6 K to Tc at magnetic fields up to 8 T. A vortex phase diagram is depicted based on these measurements. Two phase boundaries Hirrbulk(T) and Hirrg(T) characterizing different irreversible flux motions are found. The Hirrbulk(T) is characterized by the appearance of the linear resistivity. A large separation between the bulk irreversibility field at 0 K and the upper critical field Hc2(0) has been found, it is interpreted as either due to a quantum vortex liquid induced by strong quantum fluctuation of vortices at 0 K, or flux flow through weak-link channels. It is further found that the magnetic relaxation rate is weakly dependent on temperature but strongly dependent on field indicating a trivial influence of thermal fluctuation on the vortex depinning process. Therefore the phase line Hirrbulk(T) may be attributed to quantum vortex melting in the rather clean system at a finite temperature. The second boundary Hirrg(T) reflects the irreversible flux motion in some local regions due to either very strong pinning or the surface barrier on the tiny grains." @default.
- W1978997419 created "2016-06-24" @default.
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- W1978997419 date "2001-11-01" @default.
- W1978997419 modified "2023-10-17" @default.
- W1978997419 title "Flux dynamics and vortex phase diagram of the new superconductor MgB2" @default.
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- W1978997419 doi "https://doi.org/10.1016/s0921-4534(01)00936-4" @default.
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