On the possibility of observation of the 3D–2D phase transition in vortex lattice of layered high-temperature superconductors of BSCCO (Bi1.7Pb0.3Sr2Ca2Cu3Oy)

Chigvinadze, J. G.; Iashvili, A. A.; Machaidze, T. V.

doi:10.1016/s0375-9601(02)00195-0

Cited by 13 publications

(21 citation statements)

References 9 publications

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“…ξ(0) varied from 14.7 to 23.3 Å with the content y. Similar results are reported for the coherence length ξ(0) and H c2 (0) values for Bi-2223 superconductors [41][42][43].…”

Section: Resultssupporting

confidence: 82%

Effect of High Valancy Cations on the Intergranular Pinning Energies of (Bi-Pb)2Sr2Ca2Cu3O10+δ Samples

Yazici

Erdem

Özçelık

2012

J Supercond Nov Magn

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In the present work, Bi-Pb-V-Sr-Ca-Cu-Ti-O bulk samples with nominal composition (BiPb) 2 V x Sr 2 Ca 3 Cu 4−y Ti y O 12+δ with x = 0.2 and y = 0.1, 0.2 and 0.3 compounds have been prepared by the melt-quenching method. The magnetoresistance of the samples has been measured for different values of the applied magnetic field. Using the resistivity data, the upper critical magnetic field H c2 (0) at T = 0 K was calculated. The coherence lengths at T = 0 K were calculated from H c2 (0) values. The thermally activated flux creep model has been studied in order to calculate the flux pinning energies. The results showed that H c2 (0) varied from 152.5 to 60.4 T and the flux pinning energies varied from 515 to 184 meV at 0 T, with the content y.

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“…ξ(0) varied from 14.7 to 23.3 Å with the content y. Similar results are reported for the coherence length ξ(0) and H c2 (0) values for Bi-2223 superconductors [41][42][43].…”

Section: Resultssupporting

confidence: 82%

Effect of High Valancy Cations on the Intergranular Pinning Energies of (Bi-Pb)2Sr2Ca2Cu3O10+δ Samples

Yazici

Erdem

Özçelık

2012

J Supercond Nov Magn

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“…Such phase transition takes place in high-temperature superconductor system Bi 1.7 Pb 0.3 Sr 2 Ca 2 Cu 3 O 10-δ [12,13]. During this transition a sharp dissipation energy decrease of moving Abrikosov vortices (almost two orders of value) takes place what in its turn could be related with an essential decrease of pinning force.…”

Section: Introductionmentioning

confidence: 98%

“…Due to the layered crystal structure and anisotropy, which are characteristic of high-temperature superconductors, it is created conditions for the appearance on B-T diagram. ( B is magnetic induction, T-is temperature) different phases [4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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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“…It creates prerequisites for phase transitions. Due to the layered crystal structure and anisotropy, which is a characteristic for high-temperature superconductors, they reveal conditions for the appearance of different phases in the B−T diagram (B is magnetic induction, T is temperature) [2][3][4][5][6][7][8][9][10][11][12][13]. For example, the Abrikosov vortex lattice begins to melt near the critical T c temperature which is followed by an essential change of vortex continuum flow dynamics along with a sharp change of character (dynamics) of the relaxation phenomena.…”

Section: Introductionmentioning

confidence: 99%

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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On the possibility of observation of the 3D–2D phase transition in vortex lattice of layered high-temperature superconductors of BSCCO (Bi1.7Pb0.3Sr2Ca2Cu3Oy)

Cited by 13 publications

References 9 publications

Effect of High Valancy Cations on the Intergranular Pinning Energies of (Bi-Pb)2Sr2Ca2Cu3O10+δ Samples

Effect of High Valancy Cations on the Intergranular Pinning Energies of (Bi-Pb)2Sr2Ca2Cu3O10+δ Samples

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

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

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