DocumentCode
1075641
Title
A Study on the Temperature Dependence of the Ginzburg-Landau Parameter, Thermodynamic and Upper Critical Field of Nb3Sn Strands
Author
Oh, Sangjun ; Oh, D.K. ; Bae, C.J. ; Kim, H.-C. ; Kim, Keeman
Author_Institution
Nat. Fusion Res. Center, Daejeon
Volume
17
Issue
2
fYear
2007
fDate
6/1/2007 12:00:00 AM
Firstpage
2635
Lastpage
2638
Abstract
We report detailed magnetization measurement results for two internal-tin Nb3Sn strands. The paramagnetic background of a Mitsubishi strand is about 4 times larger than that of a KAT strand below the transition temperature, which can be understood as combined effects of Pauli and Langevin paramagnetism. From magnetic relaxation measurement for the KAT strand, a possibility of surface barrier effect is discussed. After subtracting the paramagnetic background, reversible magnetization data are analysed using the Hao-Clem model and the Ginzburg-Landau parameters (kappa), the thermodynamic and the upper critical fields (Bc,Bc2) at various temperatures are obtained. The temperature dependences of kappa, Bc and Bc2 are compared with the recent theoretical calculation results for Nb3Sn and also with widely used empirical formulas.
Keywords
Ginzburg-Landau theory; magnetic relaxation; magnetic superconductors; magnetisation; niobium alloys; paramagnetism; superconducting critical field; thermodynamics; tin alloys; Eliashberg theory; Ginzburg-Landau levels; Hao-Clem model; KAT strand; Langevin paramagnetism; Mitsubishi strand; Nb3Sn - Binary; Pauli effects; empirical formulas; magnetic relaxation; magnetization reversal; paramagnetism; superconductor transition temperature; surface barrier effect; thermodynamics; upper critical field; Data analysis; Magnetic analysis; Magnetic field measurement; Magnetization; Niobium; Paramagnetic materials; Superconducting magnets; Superconducting transition temperature; Temperature dependence; Thermodynamics; Eliashberg theory; paramagnetic background; superconducting parameters; the Hao-Clem model;
fLanguage
English
Journal_Title
Applied Superconductivity, IEEE Transactions on
Publisher
ieee
ISSN
1051-8223
Type
jour
DOI
10.1109/TASC.2007.899368
Filename
4278233
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