Spectroscopy of stripe order in La1.8Sr0.2NiO4 using resonant soft x-ray diffraction |
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Authors: | Schüssler-Langeheine C Schlappa J Tanaka A Hu Z Chang C F Schierle E Benomar M Ott H Weschke E Kaindl G Friedt O Sawatzky G A Lin H-J Chen C T Braden M Tjeng L H |
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Affiliation: | II. Physikalisches Institut, Universit?t zu K?ln, Zülpicher Strasse 77, D-50937 K?ln, Germany. |
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Abstract: | 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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