Barium iron arsenide, barium cobalt arsenide, barium nickel arsenide single crystals and superconductivity upon cobalt doping Page: 3 of 16
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The discovery of superconductivity in a variety of compounds with square lattice sheets
of Fe2+ in the structure has created great attention primarily due to their non-Cu2+ based origin.
The structure types adopted by iron-based superconductors include those of ZrCuSiAs-type
RFeAsO [1, 2], and ThCr2Si2-type BaFe2As2 . In the oxypnictide RFeAsO system, electron-
and hole-doping has produced critical temperatures (Ta) as high as high as ~ 55 K in
SmFeAsOo.9Fo.1 , Gd1.8Th0.2FeAsO , and SmFeAsO0.85 . In the oxygen-free compounds
ofAFe2As2 (A = Ca, Sr, Ba) system, hole-doping has reached T values of 38 K by K-doping [7}.
The superconductivity induced by electron-doping with cobalt in BaFe2As2 was reported by us
earlier . This demonstrates that in-plane disorder is highly tolerated in Fe-sheets, without
creating localized moments. This scenario is consistent with our report on LaFeAsO system 
and in contrast with the high Tc cuprates, as Zn2+ doping induces localized moments and destroys
superconductivity. Due to the existing interest in the properties of ThCr2Si2-type BaT2As2
materials (T = transition metal), the thermodynamic and transport properties of single crystalline
T = Fe, Co, and Ni samples are surveyed. Also, bulk superconductivity by Co-doping in BaFe2As2
single crystals is reviewed.
2. Results & Discussions
In the preparation of crystals, high purity elements (> 99.9 %) were used and the source
of the elements was Alfa Aesar. The single crystals of BaT2As2 were grown each out of its
respective TAs binary where T = Fe, Co, or Ni [8, 9, 10]. Such self flux is preferred over other
metal solvents such as Sn or Pb, as flux impurities can become incorporated in the crystals. For
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Ronning, Filip; Sefat, A S; Mcguire, M M; Sales, B; Jin, R & Mandrus, D. Barium iron arsenide, barium cobalt arsenide, barium nickel arsenide single crystals and superconductivity upon cobalt doping, article, January 1, 2009; [New Mexico]. (digital.library.unt.edu/ark:/67531/metadc933831/m1/3/: accessed February 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.