Phys. Rev. Lett. 95, 156402 (2005) [4 pages]Spectroscopy of Stripe Order in La1.8Sr0.2NiO4 Using Resonant Soft X-Ray DiffractionReceived 15 February 2005; published 6 October 2005 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.156402
DOI:
10.1103/PhysRevLett.95.156402
PACS:
71.45.Lr, 61.10.Dp, 71.27.+a, 75.50.Ee
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