Geometrical barriers and lower critical field in MgB2 single crystals -: art. no. 180504

被引：28
作者：
Lyard, L
Klein, T
Marcus, J
Brusetti, R
Marcenat, C
Konczykowski, M
Mosser, V
Kim, KH
Kang, BW
Lee, HS
Lee, SI
机构：
[1] CNRS, Etud Proprietes Elect Solides Lab, F-38042 Grenoble 9, France
[2] Inst Univ France, F-38041 Grenoble, France
[3] Univ Grenoble 1, F-38041 Grenoble 9, France
[4] CNRS, Ctr Rech Tres Basses Temp, F-38042 Grenoble 9, France
[5] Commiss Energie Atom Grenoble, SPSMS, Dept Rech Fondamentale Mat Condensee, F-38054 Grenoble 9, France
[6] Ecole Polytech, Solides Irradies Lab, F-91128 Palaiseau, France
[7] Schlumberger Util Technol Grp, F-92542 Montrouge, France
[8] Pohang Univ Sci & Technol, NVCRICS, Pohang 790784, South Korea
[9] Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea
来源：
PHYSICAL REVIEW B | 2004年 / 70卷 / 18期
关键词：
D O I：
10.1103/PhysRevB.70.180504
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The first penetration field (H-p) has been deduced from local magnetization and specific heat measurements in magnesium diboride single crystals. For H-a(parallel toc), the geometrical barriers (GB) play a dominant role in the irreversibility mechanism. In thin samples, neglecting the GB in this direction would then lead to a large overestimation of H-c1 deduced from H-p through the standard elliptical formula. The lower critical field is found to be isotropic at low temperature (similar to0.11+/-0.01 T).
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页码：1 / 4
页数：4
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