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Author Martinelli, A. ♦ Palenzona, A. ♦ Tropeano, M. ♦ Ferdeghini, C. ♦ Cimberle, M. R. ♦ Ritter, C.
Source arXiv.org
Content type Text
File Format PDF
Date of Submission 2009-11-11
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics
Subject Keyword Condensed Matter - Materials Science ♦ physics:cond-mat
Abstract The structural, magnetic and resistive properties of (La1-yYy)FeAsO compounds (y = 0.10, 0.20, 0.30) have been investigated by means of X-ray and neutron powder diffraction as well as by resistivity measurements. The temperatures at which the structural transition from tetragonal to orthorhombic and the magnetic ordering take place progressively reduce by similar amounts with increasing Y substitution on account of the progressive chemical pressure increase. We propose that the structural transition could be originated by a cooperative Jahn-Teller distortion involving the alignment of the fully occupied Fe 3d(z2) orbitals in the Fe plane along the y axis, leading to the branching of the cell parameters a and b. The magnetic structure develops after the occurrence of the structural transition, but before its completion.
Description Reference: Phys. Rev. B 80 (2009) 214106
Educational Use Research
Learning Resource Type Article
Page Count 27


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