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Abstract:

Local magnetic-field effects in the high-Tc polycrystalline superconductor La1.8Sr0.2CuO4-δ were studied by means of AC susceptibility measurements with a superimposed DC magnetic field, which has proven to be a sensitive technique for detecting intergranular screening currents. Measurements were performed in different magnetic configurations, obtained by cycling the DC field. The effect of intragrain pinned vortices on the intergranular local field was examined. Experimental data were analyzed using intergranular and intragranular critical-state models. Irreversible paths are discussed. We show that the Bean model applied to superconducting grains explains qualitatively the hysteretic behavior found after cycling the DC field to different maximum values for the first and second time. © 1994.

Registro:

Documento: Artículo
Título:Irreversibility effects in polycrystalline high-Tc superconductors studied by AC susceptibility
Autor:Levy, P.; Ferrari, H.; Acha, C.; Bekeris, V.
Filiación:División Física del Sólido, Departamento de Física, Comisón Nacional de Energía Atómica, Libertador 8250 (1429), Buenos Aires, Argentina
Laboratorio de Bajas Temperaturas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I, 1428 Buenos Aires, Argentina
Palabras clave:Copper oxides; Crystalline materials; Grain boundaries; Granular materials; Lanthanum compounds; Magnetic field effects; Magnetic hysteresis; Magnetic variables measurement; Models; Vortex flow; AC susceptibility; Bean model; DC field cycling; Intergranular local field; Intergranular screening currents; Intragrain pinned vortex; Irreversibility effects; Polycrystalline; Superconducting grains; High temperature superconductors
Año:1994
Volumen:222
Número:3-4
Página de inicio:212
Página de fin:218
DOI: http://dx.doi.org/10.1016/0921-4534(94)90535-5
Título revista:Physica C: Superconductivity and its applications
Título revista abreviado:Phys C Supercond Appl
ISSN:09214534
CODEN:PHYCE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09214534_v222_n3-4_p212_Levy

Referencias:

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Citas:

---------- APA ----------
Levy, P., Ferrari, H., Acha, C. & Bekeris, V. (1994) . Irreversibility effects in polycrystalline high-Tc superconductors studied by AC susceptibility. Physica C: Superconductivity and its applications, 222(3-4), 212-218.
http://dx.doi.org/10.1016/0921-4534(94)90535-5
---------- CHICAGO ----------
Levy, P., Ferrari, H., Acha, C., Bekeris, V. "Irreversibility effects in polycrystalline high-Tc superconductors studied by AC susceptibility" . Physica C: Superconductivity and its applications 222, no. 3-4 (1994) : 212-218.
http://dx.doi.org/10.1016/0921-4534(94)90535-5
---------- MLA ----------
Levy, P., Ferrari, H., Acha, C., Bekeris, V. "Irreversibility effects in polycrystalline high-Tc superconductors studied by AC susceptibility" . Physica C: Superconductivity and its applications, vol. 222, no. 3-4, 1994, pp. 212-218.
http://dx.doi.org/10.1016/0921-4534(94)90535-5
---------- VANCOUVER ----------
Levy, P., Ferrari, H., Acha, C., Bekeris, V. Irreversibility effects in polycrystalline high-Tc superconductors studied by AC susceptibility. Phys C Supercond Appl. 1994;222(3-4):212-218.
http://dx.doi.org/10.1016/0921-4534(94)90535-5