Anisotropies of the lower and upper critical fields in MgB2 single crystals -: art. no. 057001

被引：90
|
作者：
Lyard, L
Szabó, P
Klein, T
Marcus, J
Marcenat, C
Kim, KH
Kang, BW
Lee, HS
Lee, SI
机构：
[1] CNRS, Etud Proprietes Elect Solides Lab, F-38042 Grenoble 9, France
[2] Slovak Acad Sci, Inst Expt Phys, Ctr Low Temp Phys, Kosice 04353, Slovakia
[3] UPJS, FS, Kosice 04353, Slovakia
[4] Inst Univ France, F-38041 Grenoble 9, France
[5] Univ Grenoble 1, F-38041 Grenoble 9, France
[6] CEA Grenoble, Dept Rech Fondamentale Mat Condensee, SPSMS, F-38054 Grenoble 9, France
[7] Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea
[8] Pohang Univ Sci & Technol, NVCRICS, Pohang 790784, South Korea
来源：
PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 05期
关键词：
D O I：
10.1103/PhysRevLett.92.057001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The temperature dependence of the upper (H-c2) and lower (H-c1) critical fields has been deduced from Hall probe magnetization measurements of high quality MgB2 single crystals along the two main crystallographic directions. We show that Gamma(Hc2)=H-c2parallel toab/H-c2parallel toc and Gamma(Hc1)=H-c1parallel toc/H-c1parallel toab differ significantly at low temperature (being similar to5 and similar to1, respectively) and have opposite temperature dependencies. We suggest that MgB2 can be described by a single field dependent anisotropy parameter gamma(H) (=lambda(c)/lambda(ab)=xi(ab)/xi(c)) that increases from Gamma(Hc1) at low field to Gamma(Hc2) at high field.
引用
收藏
页数：4
相关论文
共 50 条
  • [21] Superconducting gap in MgB2:: Electronic Raman scattering measurements of single crystals -: art. no. 087001
    Quilty, JW
    Lee, S
    Yamamoto, A
    Tajima, S
    PHYSICAL REVIEW LETTERS, 2002, 88 (08) : 4
  • [22] Large upper critical field and irreversibility field in MgB2 wires with SiC additions -: art. no. 092507
    Sumption, MD
    Bhatia, M
    Rindfleisch, M
    Tomsic, M
    Soltanian, S
    Dou, SX
    Collings, EW
    APPLIED PHYSICS LETTERS, 2005, 86 (09) : 1 - 3
  • [23] Compressibility of the MgB2 superconductor -: art. no. 012509
    Prassides, K
    Iwasa, Y
    Ito, T
    Chi, DH
    Uehara, K
    Nishibori, E
    Takata, M
    Sakata, M
    Ohishi, Y
    Shimomura, O
    Muranaka, T
    Akimitsu, J
    PHYSICAL REVIEW B, 2001, 64 (01)
  • [24] Influence of the upper critical-field anisotropy on the transport properties of polycrystalline MgB2 -: art. no. 033906
    Eisterer, M
    Krutzler, C
    Weber, HW
    JOURNAL OF APPLIED PHYSICS, 2005, 98 (03)
  • [25] Temperature dependence and anisotropy of the bulk upper critical field Hc2 of MgB2 -: art. no. 180505
    Sologubenko, AV
    Jun, J
    Kazakov, SM
    Karpinski, J
    Ott, HR
    PHYSICAL REVIEW B, 2002, 65 (18) : 1 - 4
  • [26] Thermal conductivity of single-crystalline MgB2 -: art. no. 014504
    Sologubenko, AV
    Jun, J
    Kazakov, SM
    Karpinski, J
    Ott, HR
    PHYSICAL REVIEW B, 2002, 66 (01)
  • [27] Specific heat of single crystal MgB2:: A two-band superconductor with two different anisotropies -: art. no. 257001
    Bouquet, F
    Wang, Y
    Sheikin, I
    Plackowski, T
    Junod, A
    Lee, S
    Tajima, S
    PHYSICAL REVIEW LETTERS, 2002, 89 (25)
  • [28] Magnetization studies on superconducting MgB2 -: lower and upper critical fields and critical current density
    Joshi, AG
    Pillai, CGS
    Raj, P
    Malik, SK
    SOLID STATE COMMUNICATIONS, 2001, 118 (09) : 445 - 448
  • [29] Upper critical fields of MgB2 thin films
    Ferrando, V
    Bernini, C
    Manfrinetti, P
    Marré, D
    Putti, M
    Tarantini, C
    Ferdeghini, C
    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2004, 408 : 127 - 129
  • [30] Peak effect and anomalous dynamic nature of a metastable state in MgB2 single crystals -: art. no. 132501
    Kim, HJ
    Lee, HS
    Kang, B
    Chowdhury, P
    Kim, KH
    Lee, SI
    PHYSICAL REVIEW B, 2004, 70 (13) : 132501 - 1
12345