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000019306 1001_ $$0P:(DE-Juel1)144092$$aLi, H.$$b0$$uFZJ
000019306 245__ $$aAnisotropic magnetoelastic coupling in single-crystalline CeFeAsO as seen via high-resolution x-ray diffraction
000019306 260__ $$aCollege Park, Md.$$bAPS$$c2011
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000019306 500__ $$aResearch at Ames Laboratory is supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Contract No. DE-AC02-07CH11358. Use of the Advanced Photon Source at Argonne National Laboratory was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
000019306 520__ $$aSingle-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.
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000019306 7001_ $$0P:(DE-HGF)0$$aYan, J.-Q.$$b1
000019306 7001_ $$0P:(DE-HGF)0$$aKim, J. W.$$b2
000019306 7001_ $$0P:(DE-HGF)0$$aMcCallum, R. W.$$b3
000019306 7001_ $$0P:(DE-HGF)0$$aLograsso, T. A.$$b4
000019306 7001_ $$0P:(DE-HGF)0$$aVaknin, D.$$b5
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