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Title: Resonant inelastic X-ray scattering study of spin-wave excitations in the cuprate parent compound Ca 2CuO 2Cl 2

By means of resonant inelastic x-ray scattering at the Cu L 3 edge, we measured the spin wave dispersion along <100> and <110> in the undoped cuprate Ca 2CuO 2Cl 2. The data yields a reliable estimate of the superexchange parameter J = 135 ± 4 meV using a classical spin-1/2 2D Heisenberg model with nearest-neighbor interactions and including quantum fluctuations. Including further exchange interactions increases the estimate to J = 141 meV. The 40 meV dispersion between the magnetic Brillouin zone boundary points (1/2, 0) and (1/4, 1/4) indicates that next-nearest neighbor interactions in this compound are intermediate between the values found in La 2CuO 4 and Sr 2CuO 2Cl 2. Here by owing to the low- Z elements composing Ca 2CuOCl 2, the present results may enable a reliable comparison with the predictions of quantum many-body calculations, which would improve our understanding of the role of magnetic excitations and of electronic correlations in cuprates.
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [4] ;  [5] ;  [5] ;  [6] ;  [2] ;  [7] ;  [7] ;  [7]
  1. Univ. Pierre et Marie Curie, Paris (France); Synchrotron SOLEIL, Gif-sur-Yvette Cedex (France)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Synchrotron SOLEIL, Gif-sur-Yvette Cedex (France)
  4. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  5. Tokyo Institute of Technology, Yokohama (Japan)
  6. CEA-Saclay, Gif-sur-Yvette (France); Karlsruhe Institute of Technology, Karlsruhe (Germany)
  7. Univ. Pierre et Marie Curie, Paris (France)
Publication Date:
Report Number(s):
Journal ID: ISSN 2469-9950; R&D Project: PO011; KC0201060; TRN: US1700546
Grant/Contract Number:
SC00112704; 1047478
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 15; Journal ID: ISSN 2469-9950
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; superconductivity; hole-doped cuprate; inelastic X-ray scattering
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1350791