Investigation of the superconducting energy gap in the compound LuNi₂B₂C by the method of point contact spectroscopy: two-gap approximation
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 esti...
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| Published in: | Физика низких температур |
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| Date: | 2006 |
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| Format: | Article |
| Language: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2006
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| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/120197 |
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| 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. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862733950485528576 |
|---|---|
| author | Bobrov, N.L. Beloborod’ko, S.I. Tyutrina, L.V. Chernobay, V.N. Yanson, I.K. Naugle, D.G. Rathnayaka, K.D.D. |
| author_facet | Bobrov, N.L. Beloborod’ko, S.I. Tyutrina, L.V. Chernobay, V.N. Yanson, I.K. Naugle, D.G. Rathnayaka, K.D.D. |
| citation_txt | 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. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| description | 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.
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| first_indexed | 2025-12-07T19:40:32Z |
| format | Article |
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| id | nasplib_isofts_kiev_ua-123456789-120197 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-12-07T19:40:32Z |
| publishDate | 2006 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Bobrov, N.L. Beloborod’ko, S.I. Tyutrina, L.V. Chernobay, V.N. Yanson, I.K. Naugle, D.G. Rathnayaka, K.D.D. 2017-06-11T12:16:19Z 2017-06-11T12:16:19Z 2006 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. 0132-6414 PACS:63.20.Kr, 72.10.Di, 73.40.Jn https://nasplib.isofts.kiev.ua/handle/123456789/120197 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. The single crystal samples for this study were graciously
 provided by P.C. Canfield and S.L. Budko at
 Ames Laboratory and Iowa State University. The authors
 are indebted to Yu.G. Naidyuk for helpful discussions.
 The work was supported in terms of the complex
 program of fundamental research «Nanosystems,
 nanomaterials and nanotechnologies» of the National
 Academy of Sciences of Ukraine (Project No 10/05-N).
 The work was supported in part by the Robert A.
 Welch Foundation (Grant No A-0514, Houston, TX),
 The Telecommunications and Informatics Task Force
 at Texas A&M University, the Texas Center for Superconductivity
 at the University of Houston
 (TCSUH) and the National Science Foundation
 (Grants Nos. DMR-010345 and DMR-0422949). Partial
 support of U.S. Civilian Independent States of the
 Former Soviet Union (Contract No UP1-2566-KH-03)
 is acknowledged. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Experimental Methods and Applications Investigation of the superconducting energy gap in the compound LuNi₂B₂C by the method of point contact spectroscopy: two-gap approximation Article published earlier |
| spellingShingle | Investigation of the superconducting energy gap in the compound LuNi₂B₂C by the method of point contact spectroscopy: two-gap approximation Bobrov, N.L. Beloborod’ko, S.I. Tyutrina, L.V. Chernobay, V.N. Yanson, I.K. Naugle, D.G. Rathnayaka, K.D.D. Experimental Methods and Applications |
| title | Investigation of the superconducting energy gap in the compound LuNi₂B₂C by the method of point contact spectroscopy: two-gap approximation |
| title_full | Investigation of the superconducting energy gap in the compound LuNi₂B₂C by the method of point contact spectroscopy: two-gap approximation |
| title_fullStr | Investigation of the superconducting energy gap in the compound LuNi₂B₂C by the method of point contact spectroscopy: two-gap approximation |
| title_full_unstemmed | Investigation of the superconducting energy gap in the compound LuNi₂B₂C by the method of point contact spectroscopy: two-gap approximation |
| title_short | Investigation of the superconducting energy gap in the compound LuNi₂B₂C by the method of point contact spectroscopy: two-gap approximation |
| title_sort | investigation of the superconducting energy gap in the compound luni₂b₂c by the method of point contact spectroscopy: two-gap approximation |
| topic | Experimental Methods and Applications |
| topic_facet | Experimental Methods and Applications |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/120197 |
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