NDLI: Enhanced Connectivity and Percolation in Binary and Doped In Situ <formula formulatype=inline><tex Notation=TeX>${rm MgB}_{2}$</tex></formula> Wires After Cold High Pressure Densification

Content Provider	IEEE Xplore Digital Library
Author	Senatore, C. Al Hossain, M.S. Flukiger, R.
Copyright Year	2002
Abstract	The cold high pressure densification technique (CHPD) was recently developed in Geneva for improving the in-field critical current density J_c of in situ binary and alloyed MgB₂ wires and tapes,. J_c of CHPD treated square wires alloyed with malic acid (C₄H₆O₅) was enhanced by a factor 2 at 10 T and 4.2 K. In order to understand the fundamental mechanism behind this strong improvement of J_c, the properties of binary and alloyed MgB₂ wires have been investigated without and with CHPD, using resistivity and specific heat measurements in the temperature range from 5 to 35 K in magnetic fields up to 15 T. In particular, a deconvolution of the specific heat data was used to determine the distribution of T_c in the samples. We have found that the effect of the densification process on the electrical and transport properties is related to the improved grain connectivity and percolation. By combining the results arising from the analysis of the T_c distribution and those from resistivity measurements, it is concluded that the minimum superconducting volume fraction needed for the percolation of a superconducting path is strongly reduced in samples treated by CHPD.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2680
Ending Page	2685
Page Count	6
File Size	677455
File Format	PDF
ISSN	10518223
Volume Number	21
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wires Conductivity Temperature measurement Superconducting magnets Heating Superconducting filaments and wires Solids $T_{c}$ distribution Cold densification connectivity ${\rm MgB}_{2}$ percolation specific heat
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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