Fluctuation study of the specific heat of Mg11B2 -: art. no. 134515

被引：16

作者：

Park, T

Salamon, MB

Jung, CU

Park, MS

Kim, K

Lee, SI

机构：

[1] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[2] Univ Illinois, Mat Res Lab, Urbana, IL 61801 USA

[3] Pohang Univ Sci & Technol, Natl Creat Res Initiat Ctr Superconduct, Pohang 790784, South Korea

[4] Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea

来源：

PHYSICAL REVIEW B | 2002年 / 66卷 / 13期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.66.134515

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The specific heat of polycrystalline (MgB2)-B-11 has been measured with high-resolution ac calorimetry from 5 to 45 K at constant magnetic fields. The excess specific heat above T-c is discussed in terms of Gaussian fluctuations and suggests that (MgB2)-B-11 is a bulk superconductor with Ginzburg-Landau coherence length xi(0) = 26 Angstrom. The transition-width broadening in field is treated in terms of lowest-Landau-level (LLL) fluctuations. That analysis requires that xi(0) = 20 Angstrom. The underestimate of the coherence length in field, along with deviations from three-dimensional LLL predictions, suggests that there is an influence from the anisotropy of B-c2 between the c axis and a-b plane.

引用

页码：1 / 5

页数：5

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