Наукова електронна бібліотека
періодичних видань НАН України
періодичних видань НАН України
Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state
Репозиторій DSpace/Manakin
JavaScript is disabled for your browser. Some features of this site may not work without it.
Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state
Тема:
Свеpхпpоводимость, в том числе высокотемпеpатуpная
Інший ID:
PACS: 74.45.+c, 74.70.–b, 74.70.Xa
Посилання:
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.
Підтримка:
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.
Дата:
2016
Переглядів:
750
Завантажень:
471
Анотація:
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.
