Point-contact Andreev reflection spectroscopic study of the superconducting gap structure in LuNi2B2C

Xin Lu, W. K. Park, Jung Dae Kim, Sunmog Yeo, Sung Ik Lee, L. H. Greene

Research output: Contribution to journalArticlepeer-review

Abstract

We employ the point-contact Andreev reflection spectroscopy technique in LuNi2B2C (Tc ∼ 16.0 K) single crystals along three different crystallographic orientations as a function of magnetic field and temperature. Our data taken on the [0 0 1] and [1 1 0] faces show gap values at ∼ 2 K of ∼ 2.4 meV, and ∼ 2.6 meV, respectively, as analyzed by the one-gap Blonder-Tinkham-Klapwijk model. Both the energy gap and the Dynes broadening parameter exhibit similar dependences on magnetic field along the two directions. Data taken as a function of temperature follow the BCS-like temperature dependence yielding 2 Δ0 / kB Tc ∼ 3.4 and ∼ 3.6, respectively. The measured gap values in [1 0 0] direction vary from 1.6 to 2.5 meV at low temperatures and disappear at the same bulk Tc.

Original languageEnglish (US)
Pages (from-to)1098-1100
Number of pages3
JournalPhysica B: Condensed Matter
Volume403
Issue number5-9
DOIs
StatePublished - Apr 1 2008
Externally publishedYes

Keywords

  • Blonder-Tinkham-Klapwijk (BTK) model
  • Borocarbide superconductor
  • Point-contact Andreev reflection spectroscopy (PCARS)

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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