Physics – Condensed Matter – Superconductivity
Scientific paper
2007-06-10
Physical B 403, 818-819 (2008)
Physics
Condensed Matter
Superconductivity
2 pages, 2 figures, submitted to the SCES conference, Houston, Texas, USA, May 13-18, 2007
Scientific paper
10.1016/j.physb.2007.10.229
Our previous point-contact Andreev reflection studies of the heavy-fermion superconductor CeCoIn$_5$ using Au tips have shown two clear features: reduced Andreev signal and asymmetric background conductance [1]. To explore their physical origins, we have extended our measurements to point-contact junctions between single crystalline heavy-fermion metals and superconducting Nb tips. Differential conductance spectra are taken on junctions with three heavy-fermion metals, CeCoIn$_5$, CeRhIn$_5$, and YbAl$_3$, each with different electron mass. In contrast with Au/CeCoIn$_5$ junctions, Andreev signal is not reduced and no dependence on effective mass is observed. A possible explanation based on a two-fluid picture for heavy fermions is proposed. [1] W. K. Park et al., Phys. Rev. B 72 052509 (2005); W. K. Park et al., Proc. SPIE-Int. Soc. Opt. Eng. 5932 59321Q (2005); W. K. Park et al., Physica C (in press) (cond-mat/0606535).
Canfield Paul. C.
Fisk Zach
Frederick Jonathan
Greene Laura H.
Park Kyoung Wan
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