NDLI: Fast Suppression of Superconductivity with Fe Site Ni Substitution in Fe$_{ 1 − x }$Ni$_{ x }$Se$_{0.5}$Te$

Content Provider	Springer Nature Link
Author	Maheshwari, P. K. Gahtori, Bhasker Awana, V. P. S.
Copyright Year	2016
Abstract	We report the effect of Ni doping on the superconductivity of FeSe$_{0.5}$Te$_{0.5}$. The single crystal samples of Fe$_{1−x}$Ni$_{ x }$Se$_{0.5}$Te$_{0.5}$ (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 Fe$_{1−x}$Ni$_{ x }$Se$_{0.5}$Te$_{0.5}$ 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 T $_{c}$ decreases fast with an increase of Ni concentration in Fe$_{1−x}$Ni$_{ x }$Se$_{0.5}$Te$_{0.5}$, namely the superconducting transition temperature (T $_{c}$) being defined as resistivity (ρ) = 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), $T_{\mathrm {c}}^{\text {onset}}$ is observed in resistivity (ρ–T) measurements but ρ = 0 is not seen down to 2 K. For x ≥ 0.07, neither $T_{\mathrm {c}}^{\text {onset}}$ nor $T_{\mathrm {c}}^{\rho = 0}$ is seen down 2 K in ρ–T measurements. It is demonstrated that Ni doping at Fe site in FeSe$_{0.5}$Te$_{0.5}$ 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 FeSe$_{0.5}$Te$_{0.5}$ single crystals is presented in the current communication.
Starting Page	2473
Ending Page	2478
Page Count	6
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	29
Issue Number	10
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2016-08-09
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fe chalcogenide superconductivity Fe$_{1−x}$Ni$_{ x }$Se$_{0.5}$Te$_{0.5}$ Structural details Magneto-transport PACS number(s) 74.70 .−b 74.25.F − 74.10 .+v 74.25.Ha Strongly Correlated Systems, Superconductivity Magnetism, Magnetic Materials Condensed Matter Physics Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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