Probing the superconducting gap symmetry of PrOs4Sb12:: A penetration depth study -: art. no. 247003

被引：110

作者：

Chia, EEM

Salamon, MB

Sugawara, H

Sato, H

机构：

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

[2] Tokyo Metropolitan Univ, Dept Phys, Hachioji, Tokyo 1920397, Japan

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 24期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.91.247003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report measurements of the magnetic penetration depth lambda in single crystals of PrOs4Sb12 down to 0.1 K, with the ac field applied along the a, b, and c directions. In all three field orientations, lambdasimilar toT(2) and superfluid density rho(s)similar toT(2) for T<0.3T(c). Data are best fit by the He-3 A-phase-like gap with multidomains, each having two point nodes along a cube axis, and parameter Delta(0)(0)/k(B)T(c)=2.6, suggesting that PrOs4Sb12 is a strong-coupling superconductor with two point nodes on the Fermi surface. We also confirm the double transitions at 1.75 and 1.85 K seen in other measurements.

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