Das flußdichteprofil zylindrischer supraleiter zweiter art

Schmucker, Von Rainer

doi:10.1080/14786437708237065

Cited by 6 publications

(1 citation statement)

References 13 publications

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“…At the Lindemann T m one has large shear-strain fluctuations γ 2 1/2 ≈ 2.7 c L . In metals the critical flow strain at which plastic deformation sets in is γ c ≈ 1/30 (Seeger 1958), and a similar flow strain (or flow stress c 66 γ c ) was assumed for the 2D FLL (Schmucker 1977). Equating γ 2 1/2 to this small critical shear strain would yield a much smaller T m ; but probably local thermal fluctuations of the shear strain will not usually produce permanent structural defects in the FLL.…”

Section: Simple Melting Criteriamentioning

confidence: 99%

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: Simple Melting Criteriamentioning

confidence: 99%

The flux-line lattice in superconductors

1995

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The quantitative determination of flux-density gradients in type-II superconductors by means of the magneto-optical faraday effect

Habermeier

Aoki

Kronmüller

1978

Phys. Stat. Sol. (a)

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Magneto-optical investigation of flux penetration in plastically deformed niobium monocrystals

Habermeier

Klein

Aoki

et al. 1979

Phys. Stat. Sol. (a)

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The penetration of the Shubnikov phase into well annealed and plastically deformed monocrystalline niobium disks is investigated by means of the magneto‐optical Faraday effect. For a plastic shear of a ≧ 50% the Shubnikov phase penetrates into plastically deformed specimens highly anisotropic. This anisotropic arrangement of the domains is attributed to the anisotropic interaction between flux lines and the arrangement of edge dislocations.

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Das flußdichteprofil zylindrischer supraleiter zweiter art

Cited by 6 publications

References 13 publications

The flux-line lattice in superconductors

The flux-line lattice in superconductors

The quantitative determination of flux-density gradients in type-II superconductors by means of the magneto-optical faraday effect

Magneto-optical investigation of flux penetration in plastically deformed niobium monocrystals

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