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Spectroscopy of stripe order in La1.8Sr0.2NiO4 using resonant soft x-ray diffraction

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arxiv cond-mat/0502357 v1 pith:FNODOTGP submitted 2005-02-15 cond-mat.str-el

C. Schuessler-Langeheine , J. Schlappa , A. Tanaka , Z. Hu , C. F. Chang , E. Schierle , M. Benomar , H. Ott
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E. Weschke G. Kaindl O. Friedt G. A. Sawatzky H.-J. Lin C. T. Chen M. Braden L. H. Tjeng
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keywords charge-orderdiffractionintensitiesnio4orderresonantx-rayabsorption
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Strong resonant enhancements of the charge-order and spin-order superstructure-diffraction intensities in La1.8Sr0.2NiO4 are observed when x-ray energies in the vicinity of the Ni L2,3 absorption edges are used. The pronounced photon-energy and polarization dependences of these diffraction intensities allow for a critical determination of the local symmetry of the ordered spin and charge carriers. We found that not only the antiferromagnetic order but also the charge-order superstructure resides within the NiO2 layers; the holes are mainly located on in-plane oxygens surrounding a Ni2+ site with the spins coupled antiparallel in close analogy to Zhang-Rice singlets in the cuprates.

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