Point-contact Andreev reflection tunneling spectroscopic (PCARTS) study of the superconducting gap structure in LuNi2B2C

We employ the point-contact Andreev reflection tunneling spectroscopy (PCARTS) technique in two sets of LuNi2B2C (Tc ∼16.0 K) single crystals along three different crystallographic orientations as a function of temperature. For one set of samples, our data taken on the [001], [110] and [100] faces s...

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Bibliographic Details
Published in:Journal of physics. Conference series 2009-03, Vol.150 (5), p.052143
Main Authors: Lu, Xin, Park, W K, Choi, Ki-Young, Lee, Sung-Ik, Yeo, Sunmog, Budko, Sergey L, Canfield, Paul C, Greene, L H
Format: Article
Language:English
Subjects:
Anisotropy
Crystal structure
Crystallography
Physics
Single crystals
Temperature dependence
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Summary:We employ the point-contact Andreev reflection tunneling spectroscopy (PCARTS) technique in two sets of LuNi2B2C (Tc ∼16.0 K) single crystals along three different crystallographic orientations as a function of temperature. For one set of samples, our data taken on the [001], [110] and [100] faces show gap values at ∼2 K of ∼2.4 meV, 2.6 meV, and 2.3 meV, respectively, as analyzed by the one-gap Blonder-Tinkham-Klapwijk model. Another set of samples gives ∼2.5 meV, 2.8 meV, and 2.7 mev, respectively. Simulated gap values as a function of temperature follow the BCS-like temperature dependence in the weak-coupling limit. The small gap anisotropy observed in both sets of samples is explained by a model assuming an anisotropic s-wave with point-nodes for the gap structure and a large tunneling cone at the interface for the point-contact junctions.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/150/5/052143