Physics – Condensed Matter – Superconductivity
Scientific paper
2010-10-20
Supercond. Sci. Technol. 24 (2011) 065011
Physics
Condensed Matter
Superconductivity
10 pages, 11 figures, 3 tables
Scientific paper
10.1088/0953-2048/24/6/065011
Superconducting single crystals of FeTe1 xSex (x=0.3-0.55) and crystals of FeTe0.65Se0.35 doped with Ni, Cu, Co, Zn, Mn, Mo, Cd, In, Pb, Hg, V, Ga, Mg, Al, Ti, Cr, Sr, or Nd into Fe ions site have been grown applying Bridgeman's method. High quality single crystals exhibit natural crystallographic planes (001), (100), and (101) with (001) being a cleavage plane. Changes of chemical composition along the crystal growth direction have been found to be negligible. The critical temperature Tconset of pure crystals varies between ~12K for x~0.3 and ~14.7K for x~0.5. Full Width at Half Maximum (FWHM) of 004 reflex of the highest quality crystals has been found to be as small as Dw=1.25 arc min. It has been found that among all of the studied dopants only Ni, Cu, and Co substitute Fe ions in FeTe0.65Se0.35 crystals and even slight amount of these ions (~2 at% of Ni, ~1 at% of Cu, and ~5 at% of Co) completely destroys superconductivity. Metallic Al, Ti, Cr, Sr, and Nd ions do not incorporate into the crystal structure. The remaining examined ions, i.e. Zn, Mn, Mo, Cd, In, Pb, Hg, V, Ga, and Mg, form inclusions together with selenium, tellurium and/or iron, what changes the chemical composition of host matrix and therefore influences Tc value. Obtained data indicate that small disorder introduced into magnetic sublattice, by partial replacement of Fe ions by nonmagnetic ions of Cu or by magnetic ions (Ni, Co) with spin value different from that of Fe ion, completely suppresses superconductivity in FeTe1 xSex system. This indicates that even if superconductivity is observed in the system containing magnetic ions it can not survive when the disorder in magnetic ions sublattice is introduced, most likely because of magnetic scattering of Cooper pairs.
Berkowski M.
Diduszko R.
Domukhovski V.
Fink-Finowicki J.
Gawryluk D. J.
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