Spectroscopy of Stripe Order in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>La</mml:mi><mml:mn>1.8</mml:mn></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mn>0.2</mml:mn></mml:msub><mml:msub><mml:mi>NiO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>Using Resonant Soft X-Ray Diffraction

C. Schüßler-Langeheine, J. Schlappa, A. Tanaka, Zhiwei Hu, C. F. Chang, E. Schierle, M. Benomar, Holger Ott, E. Weschke, G. Kaindl

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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• Physical Review Letters - View
• arXiv (Cornell University) - View - PDF
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