Spectroscopy of Stripe Order in La{sub 1.8}Sr{sub 0.2}NiO{sub 4} Using Resonant Soft X-Ray Diffraction

Journal Article · Fri Oct 07 04:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.156402· OSTI ID:20696548

Schuessler-Langeheine, C; Schlappa, J; Hu, Z; Chang, C F; Benomar, M; Braden, M; Tjeng, L H ^[1]; Tanaka, A ^[2]; Schierle, E; Weschke, E; Kaindl, G ^[3]; Ott, H ^[1]; Friedt, O ^[1]; Sawatzky, G A ^[4]; Lin, H -J; Chen, C T ^[5]

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1. II. Physikalisches Institut, Universitaet zu Koeln, Zuelpicher Strasse 77, D-50937 Cologne (Germany)
2. Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8530 (Japan)
3. Institut fuer Experimentalphysik, Freie Universitaet Berlin, Arnimallee 14, D-14195 Berlin (Germany)
4. Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia, V6T 1Z1 (Canada)
5. 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, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 95; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
CHARGE CARRIERS
CUPRATES
ELECTRON CORRELATION
LANTHANUM COMPOUNDS
NICKEL COMPLEXES
NICKEL IONS
NICKEL OXIDES
OXYGEN
PHOTONS
POLARIZATION
SOFT X RADIATION
SPIN
STRONTIUM COMPOUNDS
SYMMETRY
X-RAY DIFFRACTION
X-RAY SPECTRA