Investigation of the superconducting energy gap in the compound LuNi₂B₂C by the method of point contact spectroscopy: two-gap approximation

• Published in: Физика низких температур
• Date: 2006
• Main Authors: Bobrov, N.L., Beloborod’ko, S.I., Tyutrina, L.V., Chernobay, V.N., Yanson, I.K., Naugle, D.G., Rathnayaka, K.D.D.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2006
• Subjects: Experimental Methods and Applications
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/120197
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Investigation of the superconducting energy gap in the compound LuNi₂B₂C by the method of point contact spectroscopy: two-gap approximation / N.L. Bobrov, S.I. Beloborod’ko, L.V. Tyutrina, V.N. Chernobay, I.K. Yanson, D.G. Naugle, K.D.D. Rathnayaka // Физика низких температур. — 2006. — Т. 32, № 4-5. — С. 641–650. — Бібліогр.: 30 назв. — англ.

It is shown that the two-gap approximation is applicable for describing the dV/dI(V) spectra
 of LuNi₂B₂C–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 [A. Plecenik, M. Grajacar, S. Benacka P. Seidel, A. Pfuch,
 Phys. Rev. B49, 10016 (1994)]] and the equations of [S.I. Beloborodko, Fiz. Nizk. Temp. 29, 868
 (2003) [Low Temp. Phys. 29, 650 (2003)]. 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 ∆₀ab = 2.16 meV and ∆₀с = 1.94 meV. For the large gaps the critical temperature Tc coincides
 with the bulk, Tc = 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 10–11 K. In the ab plane the contribution from the small
 gap is much smaller and decreases rapidly as a temperature rises.