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Anomalous flux pinning of UPd2Al3
Journal of Low Temperature Physics, 1995The ac magnetic susceptibility of UPd2Al3 in the superconducting state has been measured to test of the existence of the Fulde, Ferrell, Larkin and Ovchinnikov (FFLO) state. A dip in the susceptibility has been observed in the vicinity of the upper critical field and the temperature range from zero to Tc.
Anju Sawada +5 more
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Flux creep and flux pinning in layered high-temperature superconductors
Physical Review Letters, 1990For a high-${\mathit{T}}_{\mathit{c}}$ layered superconductor, we study a flux creep when the magnetic field is parallel to the layers (the CU-O planes) and vortices move across them. In a homogeneous material, the pinning of vortices results from their interaction with the layered structure of the superconductor provided the vortex-lattice period is ...
, Ivlev, , Kopnin
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2007
Chapter 6 covers mechanisms of pinning interactions between various defects and individual flux lines. The elementary pinning force, the maximum strength of each defect, is theoretically estimated based on the Ginzburg-Landau theory. These include the condensation energy interaction, the elastic interaction, the magnetic interaction and the kinetic ...
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Chapter 6 covers mechanisms of pinning interactions between various defects and individual flux lines. The elementary pinning force, the maximum strength of each defect, is theoretically estimated based on the Ginzburg-Landau theory. These include the condensation energy interaction, the elastic interaction, the magnetic interaction and the kinetic ...
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Flux Pinning by Linear Defects
Europhysics Letters (EPL), 1992The influence of randomly distributed linear defects (LDs) on the statistical mechanics of flux line (FL) arrays in superconductors is studied. We have found glassy phase with infinite correlation length along LDs, hexatic glassy phase, lock-in transition with respect to the B tilt from the LD direction. Transport phenomena are analysed.
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Collective flux pinning in a defective flux vortex lattice
Journal of Applied Physics, 1985The Larkin and Ovchinnikov (LO) theory for the summation of local pinning forces on flux vortices in type II superconductors describes the collective interaction between a perfectly elastic vortex lattice and a subthreshold pinning potential. Using a similar minimization procedure, it is shown that the elastic solution derived by LO does not always ...
S. J. Mullock, J. E. Evetts
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2007
Chapter 7 covers the summation theories that predict the global pinning force density as a function of the elementary pinning force and number density of pinning centers. First, the statistical theory of Labusch is discussed. This theory predicted that the pinning force density has non-zero value for the elementary pinning force above the threshold ...
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Chapter 7 covers the summation theories that predict the global pinning force density as a function of the elementary pinning force and number density of pinning centers. First, the statistical theory of Labusch is discussed. This theory predicted that the pinning force density has non-zero value for the elementary pinning force above the threshold ...
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Magnetic flux pinning and flux jumps in polycrystalline MgB2
Cryogenics, 2005Abstract MgB 2 polycrystalline samples were fabricated under varying conditions of isostatic pressing in argon gas. The critical current densities ( J C ) were determined through measurements of hysteresis loops, and the highest value of J C at 10 K was 1.9 × 10 4 A/cm 2 at 4.8 T.
Kunitoshi Murai +4 more
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Flux Pinning Characteristics of Artificial Pinning Centers With Different Dimension
IEEE Transactions on Applied Superconductivity, 2009The crystal defects of the nano-scale, which are called artificial pinning centers (APCs), were successfully introduced into high-temperature superconductors (HTS) by nanotechnology, in order to strongly pin the quantized vortices. Critical current densities Jc of the HTS films were dramatically improved by APCs whose dimensions were controlled.
K. Matsumoto +6 more
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Rotating fields and flux pinning
Journal of Physics D: Applied Physics, 1972C P Bean recently gave a solution to the problem of a mixed-state super-conductor in a rotating field. This was a quasistatic critical-state solution. In the present paper it is shown how, when the product of the frequency and the square of the amplitude of the rotating field exceeds a certain value, Bean's solution must be modified to take account of ...
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Flux pinning property of artificial pinning center introduced by microfabrication
Physica C: Superconductivity, 2003Abstract Effective pinning centers are required for superconducting tape conductors with high critical current density J c . Pinning interaction between flux lines and pinning centers controls J c of superconductors. Artificial flux pinning centers have been introduced into NbTi filaments through the drawing process to achieve high J c ...
N. Harada +5 more
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