Tunneling spectroscopy of slightly overdoped pnictides BaFe1.88Ni0.12As2 in the superconducting and normal state-Reference-Cited by-同舟云学术

Tunneling spectroscopy of slightly overdoped pnictides BaFe1.88Ni0.12As2 in the superconducting and normal state

Published:2023-09-20 Issue:№4_2023 Volume: Page:2340501–1-2340501–6
ISSN:0579-9392
Container-title:Seriya 3: Fizika, Astronomiya
language:
Short-container-title:VMU

Author:

Nikitchenkov I. A.¹,Ilina A. D.²,Mikhailov V. M.²,Pervakov K. S.²,Vlasenko V. A.²,Kuzmichev S. A.¹,Kuzmicheva T. E.²

Affiliation:

1. Moscow State University; 2Lebedev Physical Institute, Russian Academy of Sciences

2. 2Lebedev Physical Institute, Russian Academy of Sciences

Abstract

Using tunneling spectroscopy, we measured current-voltage characteristics (CVC) and dynamic conductance spectra 𝑑𝐼(𝑉 )/𝑑𝑉 of tunneling contacts in single crystals of slightly overdoped superconducting ferro-pnictide of nominal composition BaFe1.88Ni0.12As2 with bulk critical temperature 𝑇𝑐 = 16−18 K. Besides the Andreev structure, a strong nonlinearity is observed in the obtained curves both in the superconducting and normal state. For the temperature range 4.3 − 26.4 K we determined the positions and temperature dependences of the observed features irrelated to the superconducting state. Additionally, we discuss the possible origins for the appearance of the observed features.

Funder

Ministry of Science and Higher Education of the Russian Federation

Publisher

Moscow University Press

Subject

Space and Planetary Science,General Physics and Astronomy,Astronomy and Astrophysics

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