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

Xin Lu, W. K. Park, Ki Young Choi, Sung Ik Lee, Sunmog Yeo, Sergey L. Budko, Paul C. Canfield, L. H. Greene

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Article number052143
JournalJournal of Physics: Conference Series
Volume150
Issue number5
DOIs
StatePublished - 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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