Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state
Nonlinear conductivity of point contacts (PCs) on the base of FeSe single crystals has been investigated. Measured dV/dI dependencies demonstrate the prevailing contribution to the PC conductivity caused by the degraded surface. Superconducting (SC) feature in dV/dI like a sharp zero-bias minimum...
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| Published in: | Физика низких температур |
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| Date: | 2016 |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2016
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| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/128447 |
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| Cite this: | Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state / u.G. Naidyuk, N.V. Gamayunova, O.E. Kvitnitskaya, G. Fuchs, D.A. Chareev, A.N. Vasiliev // Физика низких температур. — 2016. — Т. 42, № 1. — С. 42–48. — Бібліогр.: 26 назв. — англ. |
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Naidyuk, Yu.G. Gamayunova, N.V. Kvitnitskaya, O.E. Fuchs, G. Chareev, D.A. Vasiliev, A.N. 2018-01-09T15:38:24Z 2018-01-09T15:38:24Z 2016 Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state / u.G. Naidyuk, N.V. Gamayunova, O.E. Kvitnitskaya, G. Fuchs, D.A. Chareev, A.N. Vasiliev // Физика низких температур. — 2016. — Т. 42, № 1. — С. 42–48. — Бібліогр.: 26 назв. — англ. 0132-6414 PACS: 74.45.+c, 74.70.–b, 74.70.Xa https://nasplib.isofts.kiev.ua/handle/123456789/128447 Nonlinear conductivity of point contacts (PCs) on the base of FeSe single crystals has been investigated. Measured dV/dI dependencies demonstrate the prevailing contribution to the PC conductivity caused by the degraded surface. Superconducting (SC) feature in dV/dI like a sharp zero-bias minimum develops for relatively low ohmic PCs, where the deep areas of FeSe are involved. Analysis of dV/dI has shown that the origin of the zero-bias minimum is connected with the Maxwell part of the PC resistance, what masks energy dependent spectral peculiarities. Even so, we have found the specific features in dV/dI — the sharp side maxima, which may have connection to the SC gap, since their position follows the BCS temperature dependence. Exploring the dV/dI spectra of the rare occurrence with Andreev-like structure, the two gaps with Δ = 2.5 and 3.5 meV were identified. Funding by the National Academy of Sciences of Ukraine under project Ф3-19 is gratefully acknowledged. Yu.G.N. would like to thank G.E. Grechnev for the stimulating discussion on iron-chalcogenide superconductors, V. Grinenko and K. Nenkov for technical assistance. Yu.G.N. acknowledges partial support of Alexander von Humboldt Foundation in the frame of a research group linkage program. A.N.V. acknowledges support of the Ministry of Education and Science of the Russian Federation in the frames of Increase Competitiveness Program of NUST «MISiS» (No. К2-2014-036) and Russian Foundation for Basic Research (№ 14-02-92002). G.F. acknowledges support of the German Federal Ministry of Education and Research within the project ERA.Net RUS Plus: No146-MAGNES financed by the EU 7th FP, grant No. 609556. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Свеpхпpоводимость, в том числе высокотемпеpатуpная Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state Article published earlier |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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| title |
Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state |
| spellingShingle |
Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state Naidyuk, Yu.G. Gamayunova, N.V. Kvitnitskaya, O.E. Fuchs, G. Chareev, D.A. Vasiliev, A.N. Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| title_short |
Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state |
| title_full |
Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state |
| title_fullStr |
Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state |
| title_full_unstemmed |
Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state |
| title_sort |
analysis of nonlinear conductivity of point contacts on the base of fese in the normal and superconducting state |
| author |
Naidyuk, Yu.G. Gamayunova, N.V. Kvitnitskaya, O.E. Fuchs, G. Chareev, D.A. Vasiliev, A.N. |
| author_facet |
Naidyuk, Yu.G. Gamayunova, N.V. Kvitnitskaya, O.E. Fuchs, G. Chareev, D.A. Vasiliev, A.N. |
| topic |
Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| topic_facet |
Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| publishDate |
2016 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
Nonlinear conductivity of point contacts (PCs) on the base of FeSe single crystals has been investigated.
Measured dV/dI dependencies demonstrate the prevailing contribution to the PC conductivity caused by the
degraded surface. Superconducting (SC) feature in dV/dI like a sharp zero-bias minimum develops for relatively
low ohmic PCs, where the deep areas of FeSe are involved. Analysis of dV/dI has shown that the origin
of the zero-bias minimum is connected with the Maxwell part of the PC resistance, what masks energy dependent
spectral peculiarities. Even so, we have found the specific features in dV/dI — the sharp side maxima,
which may have connection to the SC gap, since their position follows the BCS temperature dependence.
Exploring the dV/dI spectra of the rare occurrence with Andreev-like structure, the two gaps with Δ = 2.5 and
3.5 meV were identified.
|
| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/128447 |
| citation_txt |
Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state / u.G. Naidyuk, N.V. Gamayunova, O.E. Kvitnitskaya, G. Fuchs, D.A. Chareev, A.N. Vasiliev // Физика низких температур. — 2016. — Т. 42, № 1. — С. 42–48. — Бібліогр.: 26 назв. — англ. |
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| first_indexed |
2025-12-07T15:45:47Z |
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2025-12-07T15:45:47Z |
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