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Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO<sub>1-<i>y</i></sub> (Ln = La, Nd)
Journal of the Physical Society of Japan · 2008 · Vol. 77(8) · pp. 083704–083704
Chul‐Ho Lee✉(National Institute of Advanced Industrial Science and Technology)Akira Iyo(National Institute of Advanced Industrial Science and Technology)Hiroshi Eisaki(National Institute of Advanced Industrial Science and Technology)T. Ito(National Institute of Advanced Industrial Science and Technology)M. T. Fernández‐Díaz(Institut Laue-Langevin)T. Ito(National Institute of Advanced Industrial Science and Technology)Kunihiro Kihou(National Institute of Advanced Industrial Science and Technology)Hirofumi Matsuhata(National Institute of Advanced Industrial Science and Technology)M. Braden(University of Cologne)Kazuyoshi Yamada(Tohoku University)
Abstract
The crystal structure of LnFeAsO$_{1-y}$ (Ln = La, Nd) has been studied by the powder neutron diffraction technique. The superconducting phase diagram of NdFeAsO$_{1-y}$ is established as a function of oxygen content which is determined by Rietveld refinement. The small As-Fe bond length suggests that As and Fe atoms are connected covalently. FeAs$_4$-tetrahedrons transform toward a regular shape with increasing oxygen deficiency. Superconducting transition temperatures seem to attain maximum values for regular FeAs$_4$-tetrahedrons.
Iron-based superconductors researchRare-earth and actinide compoundsPhysics of Superconductivity and MagnetismSuperconductivityRietveld refinementMaterials scienceTetrahedronNeutron diffractionPhase diagramBond lengthCrystallographyCondensed matter physicsCovalent bond
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References
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