Título:
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Magnetic relaxation and quantum tunneling of vortices in polycristalline Hg0.8Tl0.2Ba2Ca2Cu3O8+sigma
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Autor/a:
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Zhang, Xixiang; García Bach, Ma. de los Ángeles; Tejada Palacios, Javier; Xin, Y.; Sun, G. F.; Wong, K. W.
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Otros autores:
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Universitat de Barcelona |
Abstract:
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Magnetic relaxation in a polycrystalline Hg0_8Tl0.2Ba2Ca2Cu30s+6 [(Hg,Tll-1223] superconductor was measured in the temperature range 1.85-20 K with different magnetic fields applied during the cooling process. The relaxation curves show a nearly perfect linear ln(t) behavior. The temperature dependence
of the normalized relaxation rate, R = Id (M /M0)/dln(t)I, was studied for two applied magnetic fields. With the lower applied field (H.= 3 kOe), a temperature-independent R is found below 2.1 K and explained in terms of quantum tunneling of vortices. As the applied field increases (H. = 10 kOe), the transition from the thermal to the quantum regime is not found in the experimentally accessible temperature range above 1.85 K. The field dependence of R at 2.8 K is studied in order to analyze the dimensionality
of the flux-line lattice. |
Materia(s):
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-Superconductivitat -Superconductivity |
Derechos:
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(c) The American Physical Society, 1995
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Tipo de documento:
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Artículo Artículo - Versión publicada |
Editor:
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The American Physical Society
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Compartir:
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