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Valenzuela, S.O.; Bekeris, V. "History effects and pinning regimes in solid vortex matter" (2002) Physical Review B - Condensed Matter and Materials Physics. 65(13):1-10
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Abstract:

We propose a phenomenological model that accounts for the history effects observed in ac susceptibility measurements in (formula presented) single crystals [Phys. Rev. Lett. 84, 4200 (2000) and Phys. Rev. Lett. 86, 504 (2001)]. Central to the model is the assumption that the penetrating ac magnetic field modifies the vortex lattice mobility, trapping different robust dynamical states in different regions of the sample. We discuss in detail on the response of the superconductor to an ac magnetic field when the vortex lattice mobility is not uniform inside the sample. We begin with an analytical description for a simple geometry (slab) and then we perform numerical calculations for a strip in a transverse magnetic field which include relaxation effects. In calculations, the vortex system is assumed to coexist in different pinning regimes. The vortex behavior in the regions where the induced current density j has been always below a given threshold (formula presented) is described by an elastic Campbell-like regime (or a critical state regime with high critical current density, (formula presented) When the VS is shaken by symmetrical (e.g., sinusoidal) ac fields, the critical current density is modified to (formula presented) at regions where vortices have been forced to oscillate by a current density larger than (formula presented) Experimentally, an initial state with high critical current density (formula presented) can be obtained by zero-field cooling, field cooling with no applied ac field, or shaking the vortex lattice with an asymmetrical (e.g., sawtooth) field. We compare our calculations with experimental ac susceptibility results in (formula presented) single crystals. © 2002 The American Physical Society.

Registro:

Documento: Artículo
Título:History effects and pinning regimes in solid vortex matter
Autor:Valenzuela, S.O.; Bekeris, V.
Filiación:Laboratorio de Bajas Temperaturas, Departamento de Física, Universidad Nacional de Buenos Aires, Pabellón I, Ciudad Universitaria, Buenos Aires, 1428, Argentina
Año:2002
Volumen:65
Número:13
Página de inicio:1
Página de fin:10
DOI: http://dx.doi.org/10.1103/PhysRevB.65.134513
Título revista:Physical Review B - Condensed Matter and Materials Physics
Título revista abreviado:Phys. Rev. B Condens. Matter Mater. Phys.
ISSN:10980121
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v65_n13_p1_Valenzuela

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Citas:

---------- APA ----------
Valenzuela, S.O. & Bekeris, V. (2002) . History effects and pinning regimes in solid vortex matter. Physical Review B - Condensed Matter and Materials Physics, 65(13), 1-10.
http://dx.doi.org/10.1103/PhysRevB.65.134513
---------- CHICAGO ----------
Valenzuela, S.O., Bekeris, V. "History effects and pinning regimes in solid vortex matter" . Physical Review B - Condensed Matter and Materials Physics 65, no. 13 (2002) : 1-10.
http://dx.doi.org/10.1103/PhysRevB.65.134513
---------- MLA ----------
Valenzuela, S.O., Bekeris, V. "History effects and pinning regimes in solid vortex matter" . Physical Review B - Condensed Matter and Materials Physics, vol. 65, no. 13, 2002, pp. 1-10.
http://dx.doi.org/10.1103/PhysRevB.65.134513
---------- VANCOUVER ----------
Valenzuela, S.O., Bekeris, V. History effects and pinning regimes in solid vortex matter. Phys. Rev. B Condens. Matter Mater. Phys. 2002;65(13):1-10.
http://dx.doi.org/10.1103/PhysRevB.65.134513