Dimensionality of flux pinning in (Bi,Pb)2Sr2Ca2Cu3O10+δ Ag tapes with columnar defects—Crossover from two-dimensional to three-dimensional behavior

Kummeth, P.; Struller, C.; Neumüller, H.‐W.; Saemann‐Ischenko, G.

doi:10.1063/1.112101

Cited by 14 publications

(7 citation statements)

References 12 publications

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“…Long columnar pins of damaged atomic lattice were generated by high-energy heavy-ion irradiation perpendicular to the Cu-O planes in YBCO (Roas et al 1990a, Budhani et al 1992, Klein et al 1993a, c, Schuster et al 1993b, 1994c, 1995b or BSCCO (Gerhäuser et al 1992, Leghissa et al 1992, Thompson et al 1992, Schuster et al 1992a, Klein et al 1993b, c, Kummeth et al 1994, Kraus et al 1994. Clearly these linear pins are most effective when the flux lines are parallel to the pins since then large sections of the flux line are pinned simultaneously, which means a large pinning energy and a reduction of thermally activated depinning.…”

Section: Pinning Force Versus Pinning Energymentioning

confidence: 99%

“…This means that fluctuations are large when Tc, b and the anisotropy r are large, and when ( is small. Kummeth et al 1994, Kraus er al 1994a. Clearly these linear pins are most effective when the flux lines are parallel to the pins, since then large sections of the flux line are pinned simultaneously, which means a large pinning energy and a reduction of thermally activated depinning.…”

Section: Pinning Force Versus Pinning Energymentioning

confidence: 99%

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The flux-line lattice in superconductors

1995

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Magnetic flux can penetrate a type-II superconductor in form of Abrikosov vortices (also called flux lines, flux tubes, or fluxons) each carrying a quantum of magnetic flux φ 0 = h/2e. These tiny vortices of supercurrent tend to arrange in a triangular flux-line lattice (FLL) which is more or less perturbed by material inhomogeneities that pin the flux lines, and in high-T c superconductors (HTSC's) also by thermal fluctuations. Many properties of the FLL are well described by the phenomenological Ginzburg-Landau theory or by the electromagnetic London theory, which treats the vortex core as a singularity. In Nb alloys and HTSC's the FLL is very soft mainly because of the large magnetic penetration depth λ: The shear modulus of the FLL is c 66 ∼ 1/λ 2 , and the tilt modulus c 44 (k) ∼ (1 + k 2 λ 2 ) −1 is dispersive and becomes very small for short distortion wavelength 2π/k ≪ λ. This softness is enhanced further by the pronounced anisotropy and layered structure of HTSC's, which strongly increases the penetration depth for currents along the c-axis of these (nearly uniaxial) crystals and may even cause a decoupling of two-dimensional vortex lattices in the Cu-O layers. Thermal fluctuations and softening may "melt" the FLL and cause thermally activated depinning of the flux lines or of the two-dimensional "pancake vortices" in the layers. Various phase transitions are predicted for the FLL in layered HTSC's. Although large pinning forces and high critical currents have been achieved, the small depinning energy so far prevents the application of HTSC's as conductors at high temperatures except in cases when the applied current and the surrounding magnetic field are small.

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Section: Pinning Force Versus Pinning Energymentioning

confidence: 99%

Section: Pinning Force Versus Pinning Energymentioning

confidence: 99%

The flux-line lattice in superconductors

1995

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“…Thus, ion-irradiated samples of YBa2Cu307 have demonstrated [4] the 3D nature of its vortices, while initial measurements on Bi2Sr2CaCu20x were interpreted [5] to imply 2D pancakes. More recent work [6,7] has concluded that the vortices in Bi2Sr2CaCu20, show a finite interbilayer coupling (or line tension) and thus behave 3D. We report measurements showing such 3D behavior at fields and temperatures where thermal activation [l] and scaling [9] measurements imply that the vortices exhibit strongly 2D behavior.…”

Section: Manuscript Received August 261996mentioning

confidence: 82%

Effects of vortex-vortex interactions on ion-track pinning in high-T/sub c/ superconductors

Steel¹,

Hettinger²,

Miller³

et al. 1997

IEEE Trans. Appl. Supercond.

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“…It is often used in studies of the pinning mechanism. 27 Enhancement of pinning due to heat treatment and mechanical treatment can be exemplified by the formation of a finegrained material based on Nb 3 Sn (Ref. 20) and epitaxial HTSC films less than 1 mm thick.…”

Section: The Problem Of Design Of Superconducting Materials With High...mentioning

confidence: 99%

“…183 The compatible phase must be stable in a range of chemical potentials of the O 27 anion which overlaps with the chemical potential range corresponding to the stability of the superconducting phase. Thus, the strongest acid oxides will form compounds with the stronger basic oxides of the generic system in order to increase the chemical potential of O 27 to a value corresponding to the lower boundary of the stability of the Bi2212 phase. Analogously, the basic oxides will form compounds with the stronger acid oxides.…”

Section: Microcomposites Based On Phases Of the Bi ± (Pb) ± Sr ± Ca ±...mentioning

confidence: 99%

Microcomposites based on superconducting cuprates

Казин¹,

Tretyakov²

2003

Russ. Chem. Rev.

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Chemical aspects of the formation of microcomposites Chemical aspects of the formation of microcomposites based on superconducting cuprates are considered. The materials based on superconducting cuprates are considered. The materials are composed of a superconducting ceramic matrix and micro-or are composed of a superconducting ceramic matrix and micro-or nanoinclusions of the non-superconducting phase, which are nanoinclusions of the non-superconducting phase, which are uniformly distributed in the matrix. Requirements on the operat-uniformly distributed in the matrix. Requirements on the operating characteristics of the superconducting ceramics are described ing characteristics of the superconducting ceramics are described and routes to high critical current densites are outlined. Phase and routes to high critical current densites are outlined. Phase equilibria in the generic systems are considered. Physical and equilibria in the generic systems are considered. Physical and chemical criteria for the choice of phases that can form non-chemical criteria for the choice of phases that can form nonsuperconducting inclusions are proposed. Methods of prepara-superconducting inclusions are proposed. Methods of preparation and the microstructures and superconducting properties tion and the microstructures and superconducting properties of the composites based on cuprates RBa of the composites based on cuprates RBa 2 2 Cu Cu 3 3 O O 7 77 7d d (R is the (R is the rare-earth element) and on Bi rare-earth element) and on Bi 2 2 Sr Sr 2 2 CaCu CaCu 2 2 O O 8+ 8+d d and and (Bi,Pb) (Bi,Pb) 2 2 Sr Sr 2 2 Ca Ca 2 2 Cu Cu 3 3 O O 10+ 10+d d are considered. The bibliography are considered. The bibliography includes 247 references includes 247 references. .

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Dimensionality of flux pinning in (Bi,Pb)2Sr2Ca2Cu3O10+δ Ag tapes with columnar defects—Crossover from two-dimensional to three-dimensional behavior

Cited by 14 publications

References 12 publications

The flux-line lattice in superconductors

The flux-line lattice in superconductors

Effects of vortex-vortex interactions on ion-track pinning in high-T/sub c/ superconductors

Microcomposites based on superconducting cuprates

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