Upper critical field of borocarbide superconductors

Author

Lan, M.D. ; Chang, J.C. ; Lu, K.T. ; Lee, C.Y. ; Shih, H.Y. ; Jeng, G.Y.

Author_Institution

Dept. of Phys., Nat. Chung-Hsing Univ., Taichung, Taiwan

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

3607

Lastpage

3610

Abstract

We have investigated the upper critical fields of Y_1-xEr_xNi₂B₂C and Y_1-xEr_xPd₅B₃C_0.4 (0⩽x⩽1) systems by the scaling analysis of the thermal fluctuation conductivity. The experiments were done over wide magnetic field range. We are going to test the thermal fluctuation theory in the borocarbide superconducting systems. According to the scaling analysis, the thermal fluctuation conductivity should be scaled as σ_f=((T2)/H)(1/3)F[A(T-Tc(H))/((TH)(2/3))]. Because the scaling function is field independent, all scaling curves obtained under various applied fields should converge to a universal curve if the function of T _c(H) is properly chosen, We therefore obtain H_c2(T) determined by optimizing the scaling fit. The superconducting coherence length and Ginzburg-Landau parameter K in those superconductors are also estimated. We categorize the Y_1-xEr_xNi₂B₂C and Y_1-xEr _xPd₅B₃C_0.4 systems as strong type-II superconductors

Keywords

Ginzburg-Landau theory; coherence length; erbium compounds; fluctuations in superconductors; magnetoresistance; nickel compounds; palladium compounds; superconducting critical field; type II superconductors; yttrium compounds; Ginzburg-Landau parameter; YErNi₂B₂C; YErPd₅B₃C_0.4; borocarbide superconductors; coherence length; scaling analysis; strong type-II superconductors; thermal fluctuation conductivity; upper critical fields; Fluctuations; Magnetic analysis; Magnetic field measurement; Magnetic fields; Magnetoresistance; Superconducting materials; Superconducting transition temperature; Superconductivity; System testing; Thermal conductivity;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919845

Filename

919845