Journal
SOLID STATE COMMUNICATIONS
Volume 152, Issue 8, Pages 644-648Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2011.12.012
Keywords
Pnictides; Fe-based superconductors; Crystal structure analysis; Powder neutron diffraction
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Funding
- Grants-in-Aid for Scientific Research [22540380, 20001004] Funding Source: KAKEN
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We studied the relationship between crystal structure and superconductivity in iron-based superconductors. The superconducting phase diagram of LnFeAsO(1-y) (Ln = rare-earth) is established as a function of the oxygen deficient content which is determined by Rietveld refinement. The relationship between T-c and the Fe-(Pn,Ch)-Fe bond angle (Pn = pnictogen, Ch = chalcogen) indicates that T-c attains a maximum value when Fe(Pn, Ch)(4)-tetrahedrons form a regular shape. A higher T-c value could be attained with samples containing regular Fe(Pn,Ch)-tetrahedrons, an Fe-(Pn,Ch) bond length that is longer than the Fe-As bond, and an intermediate (Fe plane)-(Fe plane) distance of 9 angstrom-15 angstrom. (C) 2011 Elsevier Ltd. All rights reserved.
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