Some features of magnetic field penetration and losses in fine-filament composite superconductors

Autor:	V.S. Gorbachev, V.P. Buryak, L. M. Fisher, Sergey Savel'ev, A.B. Dugadko, O.N. Mironova, I. F. Voloshin, E A Pavlovskaja
Rok vydání:	1993
Předmět:	Superconductivity Materials science Condensed matter physics Composite number Metals and Alloys Penetration (firestop) Condensed Matter Physics Wide field Magnetic field Protein filament Materials Chemistry Ceramics and Composites Electrical and Electronic Engineering Critical field
Zdroj:	Superconductor Science and Technology. 6:863-869
ISSN:	1361-6668 0953-2048
DOI:	10.1088/0953-2048/6/12/010
Popis:	We studied magnetic field penetration and losses in NbTi/Cu/CuNi microcomposites in a wide field range for samples with varying superconducting filament diameter and spacing between them. Two qualitatively different stages of magnetic field penetration into a composite were observed. The lower critical field Bcf1, of a filament defines the boundary between these stages. In fields lower than Bcf1, the critical state arises in a metal matrix which is superconducting due to the proximity effects. The critical state in the filaments is formed just after Bcf1. A jump-like increase of the losses typical for fine-filament composites was also observed near Bcf1. We propose a physical model for a self-consistent description of our experimental results. The expression for Bcf1, which is a strong function of the filament diameter, is derived.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::14c691c2c8be9f16f249a995cd9ec00d https://doi.org/10.1088/0953-2048/6/12/010 Zobrazit plný text záznamu