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Anisotropic magnetoelastic coupling in single-crystalline CeFeAsO as seen via high-resolution x-ray diffraction

TitleAnisotropic magnetoelastic coupling in single-crystalline CeFeAsO as seen via high-resolution x-ray diffraction
Publication TypeJournal Article
Year of Publication2011
AuthorsLi HF, Yan JQ, Kim JW, McCallum RW, Lograsso TA, Vaknin D
Journal TitlePhysical Review B
Volume84
Pages220501
Date Published12
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000297549700002
Keywordssuperconductivity
Abstract

Single-crystal synchrotron x-ray diffraction studies of CeFeAsO reveal strong anisotropy in the charge-correlation lengths along or perpendicular to the in-plane antiferromagnetic (AFM) wave vector at low temperatures, indicating an anisotropic two-dimensional magnetoelastic coupling. The high-resolution setup allows to distinctly monitor each of the twin domains by virtue of a finite misfit angle between them that follows the order parameter. In addition, we find that the in-plane correlations, above the orthorhombic (O)-to-tetragonal (T) transition, are shorter than those in each of the domains in the AFM phase, indicating a distribution of the in-plane lattice constants. This strongly suggests that the phase above the structural O-to-T transition is virtually T with strong O-T fluctuations that are probably induced by spin fluctuations.
URLhttp://prb.aps.org/abstract/PRB/v84/i22/e220501
DOI10.1103/PhysRevB.84.220501
Alternate JournalPhys. Rev. B