Investigation of the superconducting energy gap in the compound LuNi$_{2}$B$_{2}$C by the method of point contact spectroscopy: two-gap approximation

Details Investigation of the superconducting energy gap in the compound LuNi$_{2}$B$_{2}$C by the method of point contact spectroscopy: two-gap approximation Investigation of the superconducting energy gap in the compound LuNi$_{2}$B$_{2}$C by the method of point contact spectroscopy: two-gap approximation

2005-11-15

arxiv.org/abs/cond-mat/0511373v1

FNT, Vol. 32, N 4, 2006

Physics

Condensed Matter

Superconductivity

10 pages, 10 figures, submitted to Fiz. Nizk. Temp. (Low Temp. Phys.)

Scientific paper

10.1063/1.2199452

It is shown that the two-gap approximation is applicable for describing the $dV/dI(V)$ spectra of LuNi$_{2}$B$_{2}$C-Ag point contacts in a wide interval of temperatures. The values and the temperature dependences of the large and the small gaps in the $ab$ plane and in the $c$ direction were estimated using the generalized BTK model and the equations of Beloborodko. In the BCS extrapolation the critical temperature of the small gap is 10 $K$ in the $ab$ plane and 14.5 $K$ in the $c$ direction. The absolute values of the gaps are $\Delta_0^{ab}=2.16$ $meV$ and $\Delta_0^c=1.94$ $meV$. For the large gaps the critical temperature coincides with the bulk $T_c$, $T_c^{bulk}=16.8$ $K$, and their absolute values are very close, being about 3 $meV$ in both orientations. In the $c$ direction the contributions to the conductivity from the small and the large gaps remain practically identical up to $10 \div 11$ $K$. In the $ab$ plane the contribution from the small gap is much smaller and decreases rapidly as a temperature rises.

Affiliated with

Also associated with

No associations

Rating

Investigation of the superconducting energy gap in the compound LuNi$_{2}$B$_{2}$C by the method of point contact spectroscopy: two-gap approximation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Investigation of the superconducting energy gap in the compound LuNi$_{2}$B$_{2}$C by the method of point contact spectroscopy: two-gap approximation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Investigation of the superconducting energy gap in the compound LuNi$_{2}$B$_{2}$C by the method of point contact spectroscopy: two-gap approximation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-8097