期刊
PHYSICAL REVIEW B
卷 95, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.95.155110
关键词
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资金
- French state funds within Investissements d'Avenir programme [ANR-11-IDEX-0004-02]
- LLB/SOLEIL
- U.S. Department of Energy, Office of Basic Energy Sciences [1047478]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC00112704]
- Dysenos AG by Kabelwerke Brugg AG Holding
- Paul Scherrer Institut
- Swiss National Science Foundation within D-A-CH programme (SNSF) [200021L 141325]
- European Community's Seventh Framework Programme [0312284]
- Fachhochschule Nordwestschweiz
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 Ca2CuO2Cl2. The data yield a reliable estimate of the superexchange parameter J = 135 +/- 4meV using a classical spin-1/2 two-dimensional 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 La2CuO4 and Sr2CuO2Cl2. Due to the low-Z elements composing Ca2CuO2Cl2, 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.
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