Boron isotope effect in single-crystal YNi2B2C and LuNi2B2C superconductors

被引：36

作者：

Cheon, KO

Fisher, IR ^{[1
]}

Canfield, PC

机构：

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

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

来源：

PHYSICA C | 1999年 / 312卷 / 1-2期

关键词：

isotope effect;

D O I：

10.1016/S0921-4534(98)00667-4

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The boron isotope effect in high-quality, single-crystal samples of YNi2B2C and LuNi2B2C superconductors is studied to probe the role of phonons in determining T-c. Values of Delta T-c = T-c(B-10) - T-c(B-11) of 0.29 +/- 0.08 and 0.16 +/- 0.07 K are obtained for YNi2B2C and LuNi2B2C, respectively, corresponding to partial isotope exponents of alpha(B) = 0.21 +/- 0.07 and 0.11 +/- 0.05. The values for YNi2B2C, are in broad agreement with previous measurements using polycrystalline samples [D.D. Lawrie, J.P. Franck, Physica C 245 (1995) 159]. The observation of a statistically significant boron isotope effect is further evidence for a phonon mechanism of superconductivity in these compounds. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

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页码：35 / 39

页数：5

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