期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 183, 期 4, 页码 769-775出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2010.01.024
关键词
Fe-based superconductors; PbO-based structure; Magnetism and superconductivity
资金
- National Center of Competence in Research MaNEP, Materials with Novel Electronic Properties
Single crystals of Fe1+xTe1-ySey have been grown with a controlled Fe excess and Se doping, and the crystal structure has been refined for various compositions. The systematic investigation of magnetic and superconducting properties as a function of the structural parameters shows how the material can be driven into various ground states, depending on doping and the structural modifications. Our results prove that the occupation of the additional Fe site, Fe2, enhances the spin localization. By reducing the excess Fe, the antiferromagnetic ordering is weakened, and the superconducting ground state is favored. We have found that both Fe excess and Se doping in synergy determine the properties of the material and an improved 3-dimensional phase diagram is proposed. (C) 2010 Elsevier Inc. All rights reserved.
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