Spectroscopy of Stripe Order in La{sub 1.8}Sr{sub 0.2}NiO{sub 4} Using Resonant Soft X-Ray Diffraction
- II. Physikalisches Institut, Universitaet zu Koeln, Zuelpicher Strasse 77, D-50937 Cologne (Germany)
- Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8530 (Japan)
- Institut fuer Experimentalphysik, Freie Universitaet Berlin, Arnimallee 14, D-14195 Berlin (Germany)
- Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia, V6T 1Z1 (Canada)
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan (China)
Strong resonant enhancements of the charge-order and spin-order superstructure-diffraction intensities in La{sub 1.8}Sr{sub 0.2}NiO{sub 4} are observed when x-ray energies in the vicinity of the Ni L{sub 2,3} 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 NiO{sub 2} layers; the holes are mainly located on in-plane oxygens surrounding a Ni{sup 2+} site with the spins coupled antiparallel in close analogy to Zhang-Rice singlets in the cuprates.
- OSTI ID:
- 20696548
- Journal Information:
- Physical Review Letters, Vol. 95, Issue 15; Other Information: DOI: 10.1103/PhysRevLett.95.156402; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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