Spectroscopic evidence for multiple order parameter components in the heavy fermion superconductor CeCoIn5 -: art. no. 107005

被引：83

作者：

Rourke, PMC

Tanatar, MA

Turel, CS

Berdeklis, J

Petrovic, C

Wei, JYT

机构：

[1] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

[2] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.94.107005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Point-contact spectroscopy was performed on single crystals of the heavy-fermion superconductor CeCoIn5 between 150 mK and 2.5 K. A pulsed measurement technique ensured minimal Joule heating over a wide voltage range. The spectra show Andreev-reflection characteristics with multiple structures which depend on junction impedance. Spectral analysis using the generalized Blonder-Tinkham-Klapwijk formalism for d-wave pairing revealed two coexisting order parameter components with amplitudes Delta(1)=0.95 +/- 0.15 meV and Delta(2)=2.4 +/- 0.3 meV, which evolve differently with temperature. Our observations indicate a highly unconventional pairing mechanism, possibly involving multiple bands.

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