Irreversibility effects in polycrystalline high-Tc superconductors studied by AC susceptibility

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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 pe...

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Autores principales: Levy, P., Ferrari, H., Acha, C., Bekeris, V.
Formato: JOUR
Materias:
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
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09214534_v222_n3-4_p212_Levy
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_09214534_v222_n3-4_p212_Levy2023-10-03T15:45:31Z Irreversibility effects in polycrystalline high-Tc superconductors studied by AC susceptibility Levy, P. Ferrari, H. Acha, C. Bekeris, V. 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 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. Fil:Levy, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ferrari, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Acha, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bekeris, V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09214534_v222_n3-4_p212_Levy
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
Levy, P.
Ferrari, H.
Acha, C.
Bekeris, V.
Irreversibility effects in polycrystalline high-Tc superconductors studied by AC susceptibility
topic_facet 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
description 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.
format JOUR
author Levy, P.
Ferrari, H.
Acha, C.
Bekeris, V.
author_facet Levy, P.
Ferrari, H.
Acha, C.
Bekeris, V.
author_sort Levy, P.
title Irreversibility effects in polycrystalline high-Tc superconductors studied by AC susceptibility
title_short Irreversibility effects in polycrystalline high-Tc superconductors studied by AC susceptibility
title_full Irreversibility effects in polycrystalline high-Tc superconductors studied by AC susceptibility
title_fullStr Irreversibility effects in polycrystalline high-Tc superconductors studied by AC susceptibility
title_full_unstemmed Irreversibility effects in polycrystalline high-Tc superconductors studied by AC susceptibility
title_sort irreversibility effects in polycrystalline high-tc superconductors studied by ac susceptibility
url http://hdl.handle.net/20.500.12110/paper_09214534_v222_n3-4_p212_Levy
work_keys_str_mv AT levyp irreversibilityeffectsinpolycrystallinehightcsuperconductorsstudiedbyacsusceptibility
AT ferrarih irreversibilityeffectsinpolycrystallinehightcsuperconductorsstudiedbyacsusceptibility
AT achac irreversibilityeffectsinpolycrystallinehightcsuperconductorsstudiedbyacsusceptibility
AT bekerisv irreversibilityeffectsinpolycrystallinehightcsuperconductorsstudiedbyacsusceptibility
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