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Relaxation and pinning in spark-plasma sintered MgB.sub.2./sub. superconductor

SYSNO ASEP	0458752
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Relaxation and pinning in spark-plasma sintered MgB₂ superconductor
Author(s)	Jirsa, Miloš (FZU-D)_{RID, ORCID} Rameš, Michal (FZU-D)_{RID, ORCID} Koblischka, M.R. (DE) Koblischka-Veneva, A. (DE) Berger, K. (FR) Douine, B. (FR)
Article number	025006
Source Title	Superconductor Science and Technology. - : Institute of Physics Publishing - ISSN 0953-2048 Roč. 29, č. 2 (2016), 1-7
Number of pages	7 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	bulk MgB₂ superconductor ; magnetic properties ; magnetic relaxation ; critical currents ; pinning force density
Subject RIV	BM - Solid Matter Physics ; Magnetism
Institutional support	FZU-D - RVO:68378271
UT WOS	000371969400015
EID SCOPUS	84954290754
DOI	10.1088/0953-2048/29/2/025006
Annotation	The model of thermally activated relaxation developed and successfully tested on high-T c superconductors (Jirsa et al 2004 Phys. Rev. B 70 0245251) was applied to magnetic data of a bulk spark-plasma sintered MgB2 sample to elucidate its magnetic relaxation behavior. MgB2 and the related borides form a superconductor class lying between classical and high-T c superconductors. In accord with this classification, the relaxation phenomena were found to be about ten times weaker than in cuprates. Vortex pinning analyzed in terms of the field dependence of the pinning force density indicates a combined pinning by normal point-like defects and by grain surfaces. An additional mode of pinning at rather high magnetic fields (of still unknown origin) was observed.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2017

Number of the records: 1