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TUNNELING SPECTROSCOPY OF BaFe2−хNiхAs2 WITH VARIATION OF DOPING DEGREE IN SUPERCONDUCTING AND NORMAL STATES
- Authors: Nikitchenkov I.A.1,2, Kuz'michev S.A.1,2, Il'ina A.D.2, Pervakov K.S.2, Vlasenko V.A.2, Kuz'micheva T.E.2
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Affiliations:
- Lomonosov Moscow State University, Faculty of Physics
- Lebedev Physical Institute of the Russian Academy of Sciences
- Issue: Vol 166, No 6 (2024)
- Pages: 834-845
- Section: ORDER, DISORDER AND PHASE TRANSITIONS IN CONDENSED MATTER
- URL: https://journals.rcsi.science/0044-4510/article/view/274798
- DOI: https://doi.org/10.31857/S0044451024120071
- ID: 274798
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Abstract
Single crystals of pnictides BaFe2−хNiхAs2 with underdoped composition (x = 0.08) and overdoped compositions (x = 0.12, 0.14) were studied by tunneling spectroscopy in superconducting and normal states. The obtained I(V)- and dI(V)/dV characteristics of tunnel contacts reproducibly showed nonlinearity both below and above the critical temperature Tc, not directly related to superconducting properties. Its evolution with temperature and Tc along the doping phase diagram was studied, and possible causes of this nonlinearity existence are discussed.
About the authors
I. A. Nikitchenkov
Lomonosov Moscow State University, Faculty of Physics; Lebedev Physical Institute of the Russian Academy of Sciences
Email: kuzmichev@mig.phys.msu.ru
Russian Federation, Moscow, 119991; Moscow, 119991
S. A. Kuz'michev
Lomonosov Moscow State University, Faculty of Physics; Lebedev Physical Institute of the Russian Academy of Sciences
Email: kuzmichev@mig.phys.msu.ru
Russian Federation, Moscow, 119991; Moscow, 119991
A. D. Il'ina
Lebedev Physical Institute of the Russian Academy of Sciences
Email: kuzmichev@mig.phys.msu.ru
Russian Federation, Moscow, 119991
K. S. Pervakov
Lebedev Physical Institute of the Russian Academy of Sciences
Email: kuzmichev@mig.phys.msu.ru
Russian Federation, Moscow, 119991
V. A. Vlasenko
Lebedev Physical Institute of the Russian Academy of Sciences
Email: kuzmichev@mig.phys.msu.ru
Russian Federation, Moscow, 119991
T. E. Kuz'micheva
Lebedev Physical Institute of the Russian Academy of Sciences
Author for correspondence.
Email: kuzmichev@mig.phys.msu.ru
Russian Federation, Moscow, 119991
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