Real-time imaging of the magnetic flux distribution in superconducting YBa2Cu3O7−δ

Durán, C.; Gammel, P. L.; Wolfe, R.; Fratello, V. J.; Bishop, David J.; Rice, J. P.; Ginsberg, D. M.

doi:10.1038/357474a0

Cited by 133 publications

(54 citation statements)

References 13 publications

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“…Small defects at the edges cause the magnetic flux to penetrate the sample due to enhanced local field. 37 These defects can be seen at the edges of all samples shown. The black dashed line indicates the only long defect visible under a polarization microscope.…”

Section: B 05°vicinal Anglementioning

confidence: 89%

Crossover between fractal and nonfractal flux penetration in high-temperature superconducting thin films

et al. 1998

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In this study the role of anisotropy on flux penetration in c-axis epitaxial Tl 2 Ba 2 CuO 6ϩx and YBa 2 Cu 3 O 7Ϫx films is investigated by magneto-optics. We study thin films of Tl 2 Ba 2 CuO 6ϩx on substrates with vicinal angles of 0°͑well-oriented͒, 0.5°, 2.5°, and 4°and YBa 2 Cu 3 O 7Ϫx films as a function of chain-conduction-induced anisotropy. A crossover from fractal to nonfractal flux penetration is observed with increasing anisotropy. Numerical simulations of anisotropic flux motion are compared with experiment. ͓S0163-1829͑98͒05742-7͔

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Section: B 05°vicinal Anglementioning

confidence: 89%

Crossover between fractal and nonfractal flux penetration in high-temperature superconducting thin films

et al. 1998

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“…This in agreement with the concept that the application of high pressure leads to a redistribution (by diffusion) of the labile components from the phase of lower T c to HTSC phase In our case, one of the possible reasons of the phase separation could be the origination of the low Т с in the TB boundaries. Indeed, experiments on the vortex structure [19,20] have shown that the density of vortices in TB increases compared with their density in the volume of the superconductor, indicating the suppression of Т с in the TB. This can be due to the low oxygen concentration in the TB plane, which effectively implies the high concentration of oxygen vacancies [21], as a consequence of mechanical tensions.…”

Section: Calculations Using Eq (3) Demonstrate That the Equilibrium mentioning

confidence: 99%

Phase separation in oxygen deficient ΗοBa₂Cu₃O_7-δ single crystals: effect of high pressure and twin boundaries

Вовк¹,

Nazyrov²,

Obolenskii³

et al. 2011

Philosophical Magazine

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“…TPs strongly affect pinning and dynamics of vortices [23][24][25]. In particular, being plane defects they form channels of easy vortex motion along the plane of twins [24,25].…”

Section: T=t/(t C -∆T Irr ) (B)mentioning

confidence: 99%

“…In particular, being plane defects they form channels of easy vortex motion along the plane of twins [24,25]. Due to suppression of superconducting order parameter within the TPs some part of vortices is trapped by the TPs [26], and pinning of these vortices along the TPs may be reduced as compared with pinning in the bulk of the crystal [24].…”

Section: T=t/(t C -∆T Irr ) (B)mentioning

confidence: 99%

Effect of electron irradiation on vortex dynamics inYBa2Cu3O7<

et al. 2001

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We report on drastic change of vortex dynamics with increase of quenched disorder: for rather weak disorder we found a single vortex creep regime, which we attribute to a Bragg-glass phase, while for enhanced disorder we found an increase of both the depinning current and activation energy with magnetic field, which we attribute to entangled vortex phase. We also found that introduction of additional defects always increases the depinning current, but it increases activation energy only for elastic vortex creep, while it decreases activation energy for plastic vortex creep.PACS numbers: 74.60. Jg, 74.60.Ge, 74.60.Ec, 74.72.Bk The effect of random pinning on crystalline order and on dynamics of the flux-line-lattice (FLL) was a subject of numerous experimental and theoretical investigations. . The field H on was interpreted as a phase boundary between low field ordered and high field disordered vortex phases. These experimental results are supported by theoretical studies. It was shown that in presence of rather weak disorder the FLL retains a quasilong-range order resulting in the so-called Bragg glass phase [4]. However, with the increase of random pinning or magnetic field a transition to strongly disordered entangled vortex phase (glass phase) is predicted [5,6]. A sharp increase in magnetization below the fish-tail peak position H p was observed in N d 1.85 Ce 0.15 CuO 4−d [7] and non twinned YBa 2 Cu 3 O 7−δ [8] single crystals.Magnetic measurements showed that in optimally doped YBa 2 Cu 3 O 7−δ crystals no fishtail behavior is observed both in detwinned [9] and twinned [10] samples, while decrease of the oxygen content always induced non monotonous J m (H)-curves. Two distinctive peculiarities in the magnetization curves of oxygen deficient [10] and electron irradiated [11] crystals were observed: (1) the peaks H on and H p shift toward lower magnetic fields with increasing defect concentration, and (2) in magnetic fields H < H p the current J m increases, while in magnetic fields H > H p the current J m decreases with increasing defect concentration. It is believed [12,13] that the peak H p separates elastic vortex creep in low and plastic vortex creep, mediated by motion of the FLL dislocations, in high magnetic fields. Thus the introduction of additional defects leads to an increase of vortex pinning in the region of elastic creep and such behavior is expected. On the other hand, decrease of pinning force with increasing disorder observed in the region of plastic creep is non trivial, and reasons of such behavior are not known. The aim of this paper is to show the effect of point-like defects concentration on vortex dynamics and pinning parameters in YBa 2 Cu 3 O 7−δ single crystals.The investigated sample was YBa 2 Cu 3 O 7−δ single crystal with T c ≈ 93.5 K and ∆T c < 0.5 K. Twin planes (TP's) inside the measured part of the sample were aligned in one direction. The transport current was applied along the ab-plane and at an angle α = 45 • with respect to TP's. Measurements were performed in magnet...

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Real-time imaging of the magnetic flux distribution in superconducting YBa2Cu3O7−δ

Cited by 133 publications

References 13 publications

Crossover between fractal and nonfractal flux penetration in high-temperature superconducting thin films

Crossover between fractal and nonfractal flux penetration in high-temperature superconducting thin films

Phase separation in oxygen deficient ΗοBa₂Cu₃O_7-δ single crystals: effect of high pressure and twin boundaries

Effect of electron irradiation on vortex dynamics inYBa2Cu3O7<

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Real-time imaging of the magnetic flux distribution in superconducting YBa2Cu3O7−δ

Cited by 133 publications

References 13 publications

Crossover between fractal and nonfractal flux penetration in high-temperature superconducting thin films

Crossover between fractal and nonfractal flux penetration in high-temperature superconducting thin films

Phase separation in oxygen deficient ΗοBa2Cu3O7-δ single crystals: effect of high pressure and twin boundaries

Effect of electron irradiation on vortex dynamics inYBa2Cu3O7<

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Phase separation in oxygen deficient ΗοBa₂Cu₃O_7-δ single crystals: effect of high pressure and twin boundaries