The irreversibility line and flux creep

Xue, Y. Y.; Zj, Huang; Fang, Huihui; Chan, W. C.; Hor, P. H.; Chu, C. W.; Norton, Michael L.; Tang, Hung-Jie

doi:10.1016/0921-4534(92)90691-5

Cited by 5 publications

(3 citation statements)

References 37 publications

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“…where M 0 is the unrelaxed value of M and t 0 is a time constant. Investigations of the fast relaxation in high-T c superconductors performed by magnetic measurements demonstrated that in most cases a logarithmic dependence was indeed observed [195,[198][199][200][201][202][203][204]. The corresponding activation energy U 0 increases with increasing temperature [199,200,[202][203][204][205].…”

Section: Magnetic Relaxationmentioning

confidence: 99%

“…Investigations of the fast relaxation in high-T c superconductors performed by magnetic measurements demonstrated that in most cases a logarithmic dependence was indeed observed [195,[198][199][200][201][202][203][204]. The corresponding activation energy U 0 increases with increasing temperature [199,200,[202][203][204][205]. Various theoretical explanations of this phenomenon in the framework of different models were put forward, such as a vortex-glass transition [187], intergranular decoupling [202], percolation of the magnetic flux in random pinning potentials [200], nonlinear dependence of the pinning potential on current U p (j ) [201,206] and collective pinning [207].…”

Section: Magnetic Relaxationmentioning

confidence: 99%

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Magnetic properties of fullerene superconductors

Buntar¹,

Weber²

1996

Supercond. Sci. Technol.

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A review of the superconducting magnetic properties of doped fullerenes is presented. Experimental results on the main superconducting properties, such as the critical fields and the characteristic lengths, are critically discussed. Different methods to evaluate the lower critical field are discussed. Finally, experimental data on properties connected to flux pinning, such as the critical current density, the irreversibility line and the pinning force, are summarized and discussed.

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Section: Magnetic Relaxationmentioning

confidence: 99%

Section: Magnetic Relaxationmentioning

confidence: 99%

Magnetic properties of fullerene superconductors

Buntar¹,

Weber²

1996

Supercond. Sci. Technol.

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“…1), to a good approximation, is directly proportional to the critical current [9]. The exponent of 3 has been observed in Ba2Sr2CaCu208 [10], but not in sample A nor other BKBO [11,12] nor in…”

Section: Magnetizationmentioning

confidence: 89%

Heat conduction in Ba1?xKxBiO3

et al. 1995

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We have investigated heat conduction of single crystal Bal.xKxBiO 3 in the temperature range of 2-300 K and in a magnetic field of up to 6 Tesla. Temperature dependence of thermal conductivity ~T) reveals the participation of both electrons and phonons with their relative contributions that depend critically on the potassium doping concentration. Crystals underdoped with potassium (samples with higher Tc) exhibit a strong suppression of g and a glass-like temperature dependence. In contrast, those with a higher potassium content (lower Tc) show an increase as temperature decreases with a peak near 23 K. Field dependence of x(H) is also very sensitive to the level of potassium doping. Crystals exhibiting a large phonon contribution show an initial drop in g(H) at low fields followed by a minimum and then a slow rise to saturation as the field increases. The initial drop is due to the additional phonon scattering by magnetic vortices as the sample enters a mixed state. The high field behavior of ~H), arising from a continuous break-up of Cooper pairs, exhibits scaling which suggests the presence of an unconventional superconducting gap structure in this material.

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