Institute of Physics Ministry of Science and Education Republic of Azerbaijan

2023 01 en p.44-48

V.M. Aliyev, G.I. Isakov, J.A. Rahimov¹, V.I. Eminova, S.Z. Damirova, G.A. Aliyeva²,
Analysis of fluctuation conductivity in Y_0,3Cd_0,7Ba₂Cu₃O_7-δ

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ABSTRACT

A study was made of the influence of substitution of up to 50% of yttrium for cadmium in YBa₂Cu₃O_7-δ polycrystals on the mechanism of formation of excess conductivity. It has been established that such a substitution led to a significant increase in the resistivity of Y_0,3Cd_0,7Ba₂Cu₃O_7-δ and the value of the critical transition temperature Tc to the superconducting state decreases. The mechanism of formation of fluctuation conductivity (T) near Tc is considered within the framework of the Aslamazov-Larkin theory. The Ginzburg temperature, the critical temperature in the mean field approximation, and the 3D-2D crossover temperature were determined. In is shown that the doping of YBa₂Cu₃O_7-δ with cadmium leads to the coherence length along the c axis by a factor of 1,96. An analysis of the excess conductivity of the Y_0,3Cd_0,7Ba₂Cu₃O_7-δ sample within the framework of the local pair model made it possible to determine the temperature dependences of the pseudogap and its maximum value.

Keywords: superconductivity, pseudogap, excess conductivity, coherence length, composition.
PACS: 74.25. Fy, 74.20.Mn, 74.72. ± h, 74.25. ± q, 74.25.Jb

DOI:-

Received: 23.01.2023

AUTHORS & AFFILIATIONS

Institute of Physics Ministry of Science and Education of Azerbaijan, 131, H. Javid Ave.,Baku, AZ 1143,
1. Azerbaijan Medical University, 23, Bakikhanov st., Baku, AZ 1022
2. Institute of NCP Ministry of Science and Education of Azerbaijan, 30 Khojaly ave., Baku, AZ 1025, Azerbaijan
E-mail: v_aliev@bk.ru

Graphics and Images

Fig.1-2-3-4

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