Anisotropy of the upper critical field in superconductors with anisotropic gaps:: Anisotropy parameters of MgB2

被引：89

作者：

Miranovic, P ^{[1
]}

Machida, K

Kogan, VG

机构：

[1] Okayama Univ, Dept Phys, Okayama 7008530, Japan

[2] Iowa State Univ Sci & Technol, Ames Lab, DOE, Ames, IA 50011 USA

[3] Iowa State Univ Sci & Technol, Dept Phys, Ames, IA 50011 USA

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2003年 / 72卷 / 02期

关键词：

upper critical field; multiband superconductivity;

D O I：

10.1143/JPSJ.72.221

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The upper critical field H-c2 is evaluated for weakly-coupled two-band anisotropic superconductors. By modeling the actual bands and the gap distribution of MgB2 by two Fermi surface spheroids with average parameters of the real material, we show that H-c2,H-ab/H-c2,H-c increases with decreasing temperature in agreement with available data.

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页码：221 / 224

页数：4

相关论文

共 27 条

[1] Temperature and field dependence of the anisotropy of MgB2 -: art. no. 167004 [J].

Angst, M ;

Puzniak, R ;

Wisniewski, A ;

Jun, J ;

Kazakov, SM ;

Karpinski, J ;

Roos, J ;

Keller, H .

PHYSICAL REVIEW LETTERS, 2002, 88 (16) :1670041-1670044

[2]

[Anonymous], 1965, APPL MATH SER

[3] Two-band Ginzburg-Landau theory for the lower critical field Hc1 in MgB2 [J].

Askerzade, IN ;

Gencer, A ;

Güclü, N ;

Kiliç, A .

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2002, 15 (06) :L17-L20

[4]

BADR MH, CONDMAT0206391

[5] Coexistence of covalent and metallic bonding in the boron intercalation superconductor MgB2 -: art. no. 092503 [J].

Belashchenko, KD ;

van Schilfgaarde, M ;

Antropov, VP .

PHYSICAL REVIEW B, 2001, 64 (09)

[6] Phenomenological two-gap model for the specific heat of MgB [J].

Bouquet, F ;

Wang, Y ;

Fisher, RA ;

Hinks, DG ;

Jorgensen, JD ;

Junod, A ;

Phillips, NE .

EUROPHYSICS LETTERS, 2001, 56 (06) :856-862

[7] Temperature-dependent Hc2 anisotropy in MgB2 as inferred from measurements on polycrystals -: art. no. 212501 [J].

Bud'ko, SL ;

Canfield, PC .

PHYSICAL REVIEW B, 2002, 65 (21) :1-3

[8] Determination of superconducting anisotropy from magnetization data on random powders as applied to LuNi2B2C, YNi2B2C, and MgB2 -: art. no. 180506 [J].

Bud'ko, SL ;

Kogan, VG ;

Canfield, PC .

PHYSICAL REVIEW B, 2001, 64 (18)

[9] The origin of the anomalous superconducting properties of MgB2 [J].

Choi, HJ ;

Roundy, D ;

Sun, H ;

Cohen, ML ;

Louie, SG .

NATURE, 2002, 418 (6899) :758-760

[10] TRANSFORMATION OF GORKOVS EQUATION FOR TYPE 2 SUPERCONDUCTORS INTO TRANSPORT-LIKE EQUATIONS [J].

EILENBERGER, G .

ZEITSCHRIFT FUR PHYSIK, 1968, 214 (02) :195-+