Maheshwari, P. K. and Gahtori, Bhasker and Awana, V. P. S. (2016) Fast Suppression of Superconductivity with Fe Site Ni Substitution in Fe1-xNixSe0.5Te0.5 (x=0.0 to 0.20) Single Crystals. Journal of Superconductivity and Novel Magnetism, 29 (10). 2473-2478 . ISSN 1557-1939

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We report the effect of Ni doping on the superconductivity of FeSe0.5Te0.5. The single crystal samples of Fe1-xNixSe0.5Te0.5 (x = 0.0 to 0.20) series are synthesized via vacuum shield solid-state reaction route and high-temperature heating followed by slow cooling. All the crystals of Fe1-xNixSe0.5Te0.5 series with x up to 0.20, i. e., 20 % substitution of Ni at Fe site, are crystallized in single-phase tetragonal structure with the space group P4/nmm. The electrical resistivity measurements revealed that Tc decreases fast with an increase of Ni concentration in Fe1-xNixSe0.5Te0.5, namely the superconducting transition temperature (T-c) being defined as resistivity (rho) = 0 decrease from 12 K to around 4 K and 2 K for x = 0.01 and 0.03 samples, respectively. For x = 0.05 (5 at.% Ni at Fe site), T-c(onset) is observed in resistivity (rho-T) measurements but rho = 0 is not seen down to 2 K. For x >= 0.07, neither T-c(onset) nor T-c(rho=0) is seen down 2 K in rho-T measurements. It is demonstrated that Ni doping at Fe site in FeSe0.5Te0.5 superconductor suppresses superconductivity fast. The rate of T-c depression is albeit non-monotonic. Summarily, a systematic study on suppression of superconductivity with Fe site Ni doping in flux-free gown FeSe0.5Te0.5 single crystals is presented in the current communication.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Springer Verlag.
Uncontrolled Keywords: Fe chalcogenide superconductivity Fe1−xNixSe0.5Te0.5 Structural details Magneto-transport PACS number(s) · 74.70.−b 74.25.F− 74.10.+v 74.25.Ha
Subjects: Applied Physics/Condensed Matter
Depositing User: Dr. Rajpal Walke
Date Deposited: 20 Nov 2017 07:23
Last Modified: 20 Nov 2017 07:23

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