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

Abstract

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.

Authors:
 [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:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1348292
Alternate Identifier(s):
OSTI ID: 1350791
Report Number(s):
BNL-113677-2017-JA
Journal ID: ISSN 2469-9950; R&D Project: PO011; KC0201060; TRN: US1700546
Grant/Contract Number:
SC00112704; 1047478
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 15; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; superconductivity; hole-doped cuprate; inelastic X-ray scattering

Citation Formats

Lebert, B. W., Dean, M., Nicolaou, A., Pelliciari, J., Dantz, M., Schmitt, T., Yu, R., Azuma, M., Castellan, J. -P., Miao, H., Gauzzi, A., Baptiste, B., and d'Astuto, Matteo. Resonant inelastic X-ray scattering study of spin-wave excitations in the cuprate parent compound Ca2CuO2Cl2. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.155110.
Lebert, B. W., Dean, M., Nicolaou, A., Pelliciari, J., Dantz, M., Schmitt, T., Yu, R., Azuma, M., Castellan, J. -P., Miao, H., Gauzzi, A., Baptiste, B., & d'Astuto, Matteo. Resonant inelastic X-ray scattering study of spin-wave excitations in the cuprate parent compound Ca2CuO2Cl2. United States. doi:10.1103/PhysRevB.95.155110.
Lebert, B. W., Dean, M., Nicolaou, A., Pelliciari, J., Dantz, M., Schmitt, T., Yu, R., Azuma, M., Castellan, J. -P., Miao, H., Gauzzi, A., Baptiste, B., and d'Astuto, Matteo. Fri . "Resonant inelastic X-ray scattering study of spin-wave excitations in the cuprate parent compound Ca2CuO2Cl2". United States. doi:10.1103/PhysRevB.95.155110. https://www.osti.gov/servlets/purl/1348292.
@article{osti_1348292,
title = {Resonant inelastic X-ray scattering study of spin-wave excitations in the cuprate parent compound Ca2CuO2Cl2},
author = {Lebert, B. W. and Dean, M. and Nicolaou, A. and Pelliciari, J. and Dantz, M. and Schmitt, T. and Yu, R. and Azuma, M. and Castellan, J. -P. and Miao, H. and Gauzzi, A. and Baptiste, B. and d'Astuto, Matteo},
abstractNote = {By means of resonant inelastic x-ray scattering at the Cu L3 edge, we measured the spin wave dispersion along <100> and <110> in the undoped cuprate Ca2CuO2Cl2. 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 La2CuO4 and Sr2CuO2Cl2. Here by owing to the low-Z elements composing Ca2CuOCl2, 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.},
doi = {10.1103/PhysRevB.95.155110},
journal = {Physical Review B},
number = 15,
volume = 95,
place = {United States},
year = {Fri Apr 07 00:00:00 EDT 2017},
month = {Fri Apr 07 00:00:00 EDT 2017}
}

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  • Cited by 1
  • We have performed neutron inelastic scattering and resonant inelastic x-ray scattering (RIXS) at the Cu-L 3 edge to study high-energy magnetic excitations at energy transfers of more than 100 meV for overdoped La 2₋xSr xCuO 4 with x=0.25 (T c=15 K) and x=0.30 (nonsuperconducting) using identical single-crystal samples for the two techniques. From constant-energy slices of neutron-scattering cross sections, we have identified magnetic excitations up to ~250 meV for x=0.25. Although the width in the momentum direction is large, the peak positions along the (π,π) direction agree with the dispersion relation of the spin wave in the nondoped La 2CuOmore » 4 (LCO), which is consistent with the previous RIXS results of cuprate superconductors. Using RIXS at the Cu-L 3 edge, we have measured the dispersion relations of the so-called paramagnon mode along both (π,π) and (π,0) directions. Although in both directions the neutron and RIXS data connect with each other and the paramagnon along (π,0) agrees well with the LCO spin-wave dispersion, the paramagnon in the (π,π) direction probed by RIXS appears to be less dispersive and the excitation energy is lower than the spin wave of LCO near (π/2,π/2). Thus, our results indicate consistency between neutron inelastic scattering and RIXS, and elucidate the entire magnetic excitation in the (π,π) direction by the complementary use of two probes. The polarization dependence of the RIXS profiles indicates that appreciable charge excitations exist in the same energy range of magnetic excitations, reflecting the itinerant character of the overdoped sample. Lastly, we find a possible anisotropy in the charge excitation intensity might explain the apparent differences in the paramagnon dispersion in the (π,π) direction as detected by the x-ray scattering.« less
  • We have performed neutron inelastic scattering and resonant inelastic x-ray scattering (RIXS) at the Cu-L₃ edge to study high-energy magnetic excitations at energy transfers of more than 100 meV for overdoped La 2-xSr xCuO₄ with x=0.25 (T c=15 K) and x=0.30 (nonsuperconducting) using identical single-crystal samples for the two techniques. From constant-energy slices of neutron-scattering cross sections, we have identified magnetic excitations up to ~250 meV for x=0.25. Although the width in the momentum direction is large, the peak positions along the (π,π) direction agree with the dispersion relation of the spin wave in the nondoped La₂CuO₄ (LCO), which ismore » consistent with the previous RIXS results of cuprate superconductors. Using RIXS at the Cu-L₃ edge, we have measured the dispersion relations of the so-called paramagnon mode along both (π,π) and (π,0) directions. Although in both directions the neutron and RIXS data connect with each other and the paramagnon along (π,0) agrees well with the LCO spin-wave dispersion, the paramagnon in the (π,π) direction probed by RIXS appears to be less dispersive and the excitation energy is lower than the spin wave of LCO near (π/2,π/2). Thus, our results indicate consistency between neutron inelastic scattering and RIXS, and elucidate the entire magnetic excitation in the (π,π) direction by the complementary use of two probes. The polarization dependence of the RIXS profiles indicates that appreciable charge excitations exist in the same energy range of magnetic excitations, reflecting the itinerant character of the overdoped sample. A possible anisotropy in the charge excitation intensity might explain the apparent differences in the paramagnon dispersion in the (π,π) direction as detected by the x-ray scattering.« less
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