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Kwok, W. K.; Paulius, L. M.; Vinokur, V. M.; Petrean, A. M.; Ronningen, R. M.; Crabtree, G. W.

doi:10.1103/physrevb.58.14594

Cited by 29 publications

(23 citation statements)

References 41 publications

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“…The dynamics of the vortex solid to liquid transition seems not to be modified by ion irradiation. Good scalings according to a 3D vortex glass transition are obtained for as grown and irradiated samples, with the same values of the 20 probably promoted by the presence of correlated disorder. The H Ϫ0.5 dependence of the activation energy in the irradiated sample is similar to that observed in proton irradiated single crystals, 10 and is interpreted in terms of point disorder introduced by ion irradiation.…”

mentioning

confidence: 57%

“…However, the dissipation in the liquid state show interesting differences. While as grown samples show an activation energy depending as 1/H on the applied magnetic field, similar to the one found in samples with correlated disorder, 20 irradiated samples show a dependence as 1/H 0.5 , characteristic of plastic deformation of vortices.…”

Section: Introductionmentioning

confidence: 85%

“…An analysis in terms of the competition between elastic and pinning energy of vortex segments pinned by columnar defects has provided the correct field dependence. 20 Interestingly, the activation energy for the irradiated sample is lower than that obtained for the non irradiated one ͑Fig. 5͒.…”

mentioning

confidence: 99%

“…The same field dependence of the activation energy has been found in YBCO crystals in presence of correlated disorder as twin boundaries, irradiation tracks or splayed defects. 20,32,33 Various defects can be in- 19 have reported the presence of dislocations parallel to the c axis going all the way to the substrate, which act as effective pinning centers. Twin boundaries and/or dislocations might act as correlated disorder stabilizing a Bose glass phase.…”

mentioning

confidence: 99%

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Vortex liquid entanglement in irradiatedYBa2Cu3O7
Sefrioui
¹
,
Arias
²
,
González
³

et al. 2001
Phys. Rev. B
43
4
23
1
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Epitaxial YBa 2 Cu 3 O 7 thin films, grown by high-pressure dc sputtering, are irradiated with He ϩ ions at 80 keV with doses between 10 14 and 10 15 cm Ϫ2 . Irradiation reduces the critical temperature but it does not modify the carrier concentration. Angle-dependent resistivity is used to show that the mass anisotropy does not change upon irradiation. The melting transition in magnetic fields applied parallel to the c axis is analyzed by I-V critical scaling, and all irradiated and nonirradiated samples show a three-dimensional vortex glass transition with the same critical exponents. The dissipation in the liquid state is analyzed in terms of the activation energy of the magnetoresistance in a perpendicular magnetic field. While as-grown samples show an activation energy depending as 1/H on the applied magnetic field, irradiated samples show a dependence as 1/H 0.5 , characteristic of plastic deformation of vortices. This is discussed in terms of the point disorder introduced by ion irradiation.

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mentioning

confidence: 57%

Section: Introductionmentioning

confidence: 85%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Vortex liquid entanglement in irradiatedYBa2Cu3O7
Sefrioui
¹
,
Arias
²
,
González
³

et al. 2001
Phys. Rev. B
43
4
23
1
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show abstract

“…3 in Ref. [32]. As the driving force is further decreased (F L = 2f 0 ), the pinning force becomes dominant, leading to a broadening of the PE [4].…”

mentioning

confidence: 99%

Peak Effect in the Critical Current of Type II Superconductors with Strong Magnetic Vortex Pinning

Fangohr

et al. 2008

Phys. Rev. Lett.

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We have performed 2D-Langevin simulations studying the peak effect (PE) of the critical current taking into account the temperature dependence of the competing forces. We observe and report that the occurrence of the PE results from the competition of vortex-vortex interactions and vortex-pin interactions and thermal fluctuations which have different temperature dependencies. The simulations reveal that the PE can only take place for certain pinning strengths, densities of pinning centers and driving forces, which is in good agreement with experiments. No apparent vortex order-disorder transition is observed across the PE regime. Besides, the PE is a dynamical phenomenon and thermal fluctuations can speed up the process for the formation of the PE.PACS numbers: 74.25. Fy, 74.25.Qt One pronounced phenomenon in type-II superconductors is the so called peak effect (PE), which is the appearance of a peak in the critical current density J c before decreasing to 0 with increasing temperature or field [1]. The PE has widely been observed in a variety of low and high temperature superconductors by different experimental techniques [2], such as transport [3][4][5], magnetization [6,7], and ac-susceptibility [8][9][10]. It was proposed long ago that the PE originated from softening of the elastic moduli of vortex lattice [1], which caused by the competitions between elastic energy E el , pinning energy E pin of vortex lattice and the energy of thermal fluctuations E th [11]. Considering the competition between the strength of vortex lattice and the pinning force of isolated pinning center, Labusch showed that J c > 0 only if the pinning force dominates over the strength of vortex lattice, otherwise J c = 0 [12]. According to the Labusch criterion the weak pinning centers in superconductors cannot pin the vortex lattice. Larkin and Ovchinnikov showed that weak pinning centers can act collectively in the correlation volume V c (=L c R 2 c , where L c and R c are the longitudinal and transverse correlation lengths respectively), where the vortices are of long-range order, reducing much the Labusch criterion [13]. In the collective pinning theory the PE was interpreted as resulting from the abrupt decrease of V c due to the reduction in elastic interaction [14]. The PE was recently shown to appear naturally at the crossover from weak collective to strong pinning [15]. Further calculations showed that the "Bragg glass" phases exist to be a quasi-long-range ordered vortex lattice on a length scale r ≫ R c [2]. Furthermore, the occurrence of PE was explained as evidence for a Bragg glass transition or an order-disorder (OD) transition [2,5,9,16]. The OD transition was suggested to be a thermodynamic phase transition induced by thermal fluctuations or pinning centers [2], which has been confirmed experimentally by the direct structural observation of the vortex lattice, such as small angle neutron scattering (SANS) [9], and muon spin relaxation [17]. Also, the investigation of the reversibility of the OD transition provided st...

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Toward Superconducting Critical Current by Design

et al. 2016

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A new critical-current-by-design paradigm is presented. It aims at predicting the optimal defect landscape in superconductors for targeted applications by elucidating the vortex dynamics responsible for the bulk critical current. To this end, critical current measurements on commercial high-temperature superconductors are combined with large-scale time-dependent Ginzburg-Landau simulations of vortex dynamics.

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Anisotropically splayed and columnar defects in untwinnedYBa2Cu3O

Cited by 29 publications

References 41 publications

Vortex liquid entanglement in irradiatedYBa2Cu3O7
Sefrioui
¹
,
Arias
²
,
González
³

et al. 2001
Phys. Rev. B
43
4
23
1
View full text Add to dashboard Cite

Vortex liquid entanglement in irradiatedYBa2Cu3O7
Sefrioui
¹
,
Arias
²
,
González
³

et al. 2001
Phys. Rev. B
43
4
23
1
View full text Add to dashboard Cite

Peak Effect in the Critical Current of Type II Superconductors with Strong Magnetic Vortex Pinning

Toward Superconducting Critical Current by Design

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Anisotropically splayed and columnar defects in untwinnedYBa2Cu3O

Cited by 29 publications

References 41 publications

Vortex liquid entanglement in irradiatedYBa2Cu3O7Sefrioui1, Arias2, González3 et al. 2001Phys. Rev. B434231View full textAdd to dashboardCite

Vortex liquid entanglement in irradiatedYBa2Cu3O7Sefrioui1, Arias2, González3 et al. 2001Phys. Rev. B434231View full textAdd to dashboardCite

Peak Effect in the Critical Current of Type II Superconductors with Strong Magnetic Vortex Pinning

Toward Superconducting Critical Current by Design

Contact Info

Product

Resources

About

Vortex liquid entanglement in irradiatedYBa2Cu3O7
Sefrioui
¹
,
Arias
²
,
González
³

et al. 2001
Phys. Rev. B
43
4
23
1
View full text Add to dashboard Cite

Vortex liquid entanglement in irradiatedYBa2Cu3O7
Sefrioui
¹
,
Arias
²
,
González
³

et al. 2001
Phys. Rev. B
43
4
23
1
View full text Add to dashboard Cite