Superconductivity

Effect of orientation of NiSb needle inclusions on temperature dependence of resistance in Cd$_{0.95}$Ni$_{0.05}$Sb crystals

V. S. Zakhvalinskii^a, E. A. Pilyuk^ba, A. V. Kochura^bc, L. A. Morgun^b, A. B. Davydov^b, Z. H. Aung^c, V. V. Rodionov^c, B. A. Aronzon<sup>b

a</sup> National Research University "Belgorod State University"
^b P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow
^c Southwest State University, Kursk

Abstract: A composite Cd$_{0.95}$Ni$_{0.05}$Sb crystal consisting of CdSb and NiSb inclusions was obtained by the modified Bridgman method. It was shown by the methods of scanning electron microscopy, X-ray phase analysis, energy-dispersive X-ray spectroscopy, and studies of Raman spectra, that the main CdSb matrix was a block single crystal (orthorhombic Pbca structure) containing microcrystalline acicular inclusions of the second NiSb phase (hexagonal structure of the NiAs type $P6_3/mmc$). It has been found that the anisotropy of single-crystal NiSb needles in samples of the Cd$_{0.95}$Ni$_{0.05}$Sb crystalline composite (needles are directed along and across the current direction) significantly affects the resistance and magnetoresistance of the crystal. The interface is a needle-like inclusion – the matrix can become superconducting, which affects the conductivity of the composite as a whole. However, this superconductivity is insufficient for the transition at the experimental temperatures to the superconducting phase with zero resistance of the composite.

Keywords: cadmium antimonide, nickel antimonide, composite, anisotropy of conductivity, interface superconductivity.

Received: 06.12.2022
Revised: 06.12.2022
Accepted: 10.12.2022

DOI: 10.21883/FTT.2023.03.54736.548

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