Pinning in layered inhomogeneous superconductors

Ovchinnikov, Yu. N.; Ivlev, B. I.

doi:10.1103/physrevb.43.8024

Cited by 103 publications

(112 citation statements)

References 4 publications

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“…In the second case trapping may occur due to the long-range pin-vortex interaction as a result of local instability. 11 The line remains trapped until the force acting from the pin does not exceed the pinbreaking force. When the line finally stops, the pinned configuration is expected to be very anisotropic because the transverse pin-to-pin displacements which are determined by trapping events are much smaller than the longitudinal displacements limited by the pin-breaking criteria.…”

Section: Introductionmentioning

confidence: 99%

Theory and simulations on strong pinning of vortex lines by nanoparticles

Koshelev

Kolton

2011

Phys. Rev. B

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Pinning of vortex lines by array of nanoparticles embedded inside superconductors became the most efficient practical way to achieve high critical currents. In this situation pinning occurs via trapping of the vortex-line segments and the critical current is determined by the typical length of trapped segment. To verify analytical estimates and develop a quantitative description of strong pinning, we numerically simulated isolated vortex lines driven through array of nanoparticles. We found that the critical force grows roughly as a square root of the pin density and it is strongly suppressed by thermal noise. The configurations of pinned lines are strongly anisotropic, displacements in the drive directions are much larger than in the transverse direction. Moreover, we found that the roughening index for the longitudinal displacements exceeds one. This indicates that the local stresses in the critical region increase with the total line length and the elastic description breaks down in the thermodynamic limit. Thermal noise reduces the anisotropy of displacements in the critical regions and straightens the lines.

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Section: Introductionmentioning

confidence: 99%

Theory and simulations on strong pinning of vortex lines by nanoparticles

Koshelev

Kolton

2011

Phys. Rev. B

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“…19,20 It is characterized by a sharp maximum of the critical current density for |B| 6 kG, behavior characteristic of a dominant contribution from strong pinning 16,17 by nm-sized inhomogeneities.…”

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confidence: 99%

Anisotropy of the coherence length from critical currents in the stoichiometric superconductor LiFeAs

et al. 2011

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Miniature Hall-probe arrays were used to measure the critical current densities for the three main directions of vortex motion in the stoichiometric LiFeAs superconductor. These correspond to vortex lines along the c-axis moving parallel to the ab-plane, and to vortex lines in the ab-plane moving perpendicular to, and within the plane, respectively. The measurements were carried out in the low-field regime of strong vortex pinning, in which the critical current anisotropy is solely determined by the coherence length anisotropy parameter, ε ξ . This allows for the extraction of ε ξ at magnetic fields far below the upper critical field Bc2. We find that increasing the magnetic field decreases the anisotropy of the coherence length.The determination of the electronic anisotropy in the superconducting state is a fundamental problem in multiband type-II superconductors, that has attracted much in interest with the discovery of the iron-based materials.

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“…Peterson andEkin (1989, 1990; cf. Barone and Paterno, 1982) suggest that an Airy diffraction pattern, in which the quantity sin(πΦ/Φ 0 ) in Eq.…”

Section: A Short Josephson Junctionmentioning

confidence: 97%

“…The second type of solution, called a breather, is a nontopological variety of soliton that is stationary (i.e., does not travel; Dodd et al, 1982;Drazin and Johnson, 1989;Kivshar et al, 1991). Sometimes, perturbation terms for dissipation and energy (current) input are added to the sine Gordon equation (Grønbech-Jensen et al, 1991;Holst et al, 1990;Malomed, 1989Malomed, , 1990Malomed and Nepomnyashchy, 1992;Olsen and Samuelsen, 1991;Pagano et al, 1991;Petras and Nordman, 1989;Ustinov et al, 1992). Phase locking can also occur, in which the fluxon motion in the long junction follows the frequency of the external field, or two such junctions can be phase locked to each other (Fernandez et al, 1990;Grønbech-Jensen, 1992;GronbechJensen et al, (1990); Pedersen and .…”

Section: B Long Josephson Junctionmentioning

confidence: 97%

“…Tunneling, like photoemission, represents a surface-probe sampling of a region of dimensions determined by the coherence length (Cucolo et al, 1991;Liu et al, 1991;Pierson and Vails 1992), which, for high-temperature superconductors, can be only one or two unit cell dimensions in magnitude. Lanping et al (1989) constructed a histogram of the distribution of gap parameters Δ determined from tunneling measurements made at 600 different surface locations on the same YBa 2 Cu 3 O 72δ sample, obtaining values ranging from 13 to 50 meV, with several data points outside this range.…”

Section: Tunneling Measurementsmentioning

confidence: 99%

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