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.
- Blonder-Tinkham-Klapwijk (BTK) model
- Borocarbide superconductor
- Point-contact Andreev reflection spectroscopy (PCARS)
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics