Determination of vortex friction in a rotating type ii superconductor with a self-compensating torsion balance

Fuhrmans, M.; Heiden, C.

doi:10.1016/0011-2275(76)90001-1

Cited by 30 publications

(9 citation statements)

References 11 publications

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“…In the first (initial) region, the sample does not respond to the increase in ω ω = one could find similarly to [24,25] the expression for the total braking torque τ [19]. If in this region the torsion head is stopped, then at the expense of relaxation processes connected with the presence of viscous forces acting on vortex filaments, the sample will continue the rotation in the same direction (with decreasing velocity) until it reaches a certain equilibrium position, depending on the value.…”

Section: Resultssupporting

confidence: 58%

Investigation of stimulated dynamics in strongly anisotropic high-temperature superconductors system Bi–Pb–Sr–Ca–Cu–O

Chigvinadze¹,

Ashimov²,

Machaidze³

2008

Physics Letters A

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It is used the mechanical method of Abrikosov vortex stimulated dynamics investigation in superconductors. With its help it was studied relaxation phenomena in vortex matter of high-temperature superconductors. It established that pulsed magnetic fields change the course of relaxation processes taking place in vortex matter. The study of the influence of magnetic pulses differing by their durations and amplitudes on vortex system of strongly anisotropic high-temperature superconductors system Bi 1.7 Pb 0.3 Sr 2 Ca 2 Cu 3 O 10-δ showed the presence of threshold phenomena. The small duration pulses doesn't change the course of relaxation processes taking place in vortex matter. When the duration of pulses exceeds some critical value (threshold), then their influence change the course of relaxation process which is revealed by stepwise change of relaxing mechanical moment .rel τ These investigation showed that the time for formatting of Abrikosov vortex lattice in Bi 1.7 Pb 0.3 Sr 2 Ca 2 Cu 3 O 10-δ is of the order of 150 µs which on the order of value exceeds the time necessary for formation of a single vortex observed in isotropic high-temperature superconductor HoBa 2 Cu 3 O 7-δ and on two orders exceeds the creation time of a single vortex observed in classical type II superconductors.

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Section: Resultssupporting

confidence: 58%

Investigation of stimulated dynamics in strongly anisotropic high-temperature superconductors system Bi–Pb–Sr–Ca–Cu–O

Chigvinadze¹,

Ashimov²,

Machaidze³

2008

Physics Letters A

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“…Torque measurements on conventional superconductors [5][6][7] were made in connection with an investigation of magnetic flux pinning by crystal lattice inhomogeneities. Since the discovery of high-temperature superconductivity (HTSC) and the observation of the orientation of fine particles of these anisotropic compounds in a magnetic field [8][9][10], the possibility of intrinsic torque in anisotropic superconductors in the region of equilibrium magnetization has been assumed [11].…”

Section: Introductionmentioning

confidence: 99%

On the transverse magnetization of the anisotropic superconductor 2H–NbSe2

Sirenko

Makedonska

Shabakayeva

et al. 2002

Low Temperature Physics

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Torque measurements were performed on a high-quality single crystal of the uniaxial superconductor 2H-NbSe 2 in a tilted magnetic field 0-200 kG, in the temperature range 1.5-4.2 K. The transverse component of the absolute magnetization was derived in a magnetic field directed at an angle of 77°to the axis of anisotropy, and its field dependence was analyzed in a reversible domain of the mixed state. The penetration depth and anisotropy characteristics were obtained for the sample under study.

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“…Just in this region, when ω 1 = ω 2 the torque τ , appeared to the uniformly rotating sample, is balanced by the countermoment τ p and τ fr . In particular, in the case of a continuously rotating sample with frequency ω 1 = ω 2 one could find similarly to [26,27] the expression for the total braking torque τ [19].…”

Section: Resultsmentioning

confidence: 79%

Investigation of relaxation phenomena in high-temperature superconductors HoBa2Cu3O7−δ at the action of pulsed magnetic fields

Chigvinadze¹,

Acrivos

Ashimov³

et al. 2007

Physics Letters A

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A mechanical method to investigate the stimulated Abrikosov vortex dynamics in superconductors has been used. We found out that pulsed magnetic fields change the path of relaxation processes taking place in vortex matter. The study of the influence of magnetic pulses differing in their durations and amplitudes on the vortex system of the isotropic high-temperature superconductor system HoBa 2 Cu 3 O 7−δ showed the presence of a threshold phenomena. Short duration pulses do not change the path of relaxation processes taking place in vortex matter. When the duration of pulses exceeds some critical value (threshold), then their influence changes the path of relaxation process which is revealed by a stepwise change of the relaxing mechanical moment τ rel . These investigations showed that the time for formatting of the Abrikosov vortex lattice in HoBa 2 Cu 3 O 7−δ is of the order of 20 µs which exceeds by one order of magnitude the time necessary for formation of a single vortex observed in type II superconductors.

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Determination of vortex friction in a rotating type ii superconductor with a self-compensating torsion balance

Cited by 30 publications

References 11 publications

Investigation of stimulated dynamics in strongly anisotropic high-temperature superconductors system Bi–Pb–Sr–Ca–Cu–O

Investigation of stimulated dynamics in strongly anisotropic high-temperature superconductors system Bi–Pb–Sr–Ca–Cu–O

On the transverse magnetization of the anisotropic superconductor 2H–NbSe2

Investigation of relaxation phenomena in high-temperature superconductors HoBa2Cu3O7−δ at the action of pulsed magnetic fields

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