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Title: Persistence of mangetic excitations in La{2-x}Sr{x}CuO{4} from the undoped insulator to the heavily overdoped non-superconducting metal

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC); Center for Emergent Superconductivity (CES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1160974
DOE Contract Number:
AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nature Materials; Journal Volume: 12; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory
Country of Publication:
United States
Language:
English
Subject:
phonons, thermal conductivity, energy storage (including batteries and capacitors), superconductivity, defects, spin dynamics

Citation Formats

Dean, M.P.M., Dellea, G., Springell, R.S., Yakhou-Harris, F., Kummer, K., Brookes, N.B., Liu, X., Sun, Y.-J., Strle, J., Schmitt, T., Braicovich, L., Ghiringhelli, G., Bozovic, I., and Hill, J.P. Persistence of mangetic excitations in La{2-x}Sr{x}CuO{4} from the undoped insulator to the heavily overdoped non-superconducting metal. United States: N. p., 2013. Web. doi:10.1038/NMAT3723.
Dean, M.P.M., Dellea, G., Springell, R.S., Yakhou-Harris, F., Kummer, K., Brookes, N.B., Liu, X., Sun, Y.-J., Strle, J., Schmitt, T., Braicovich, L., Ghiringhelli, G., Bozovic, I., & Hill, J.P. Persistence of mangetic excitations in La{2-x}Sr{x}CuO{4} from the undoped insulator to the heavily overdoped non-superconducting metal. United States. doi:10.1038/NMAT3723.
Dean, M.P.M., Dellea, G., Springell, R.S., Yakhou-Harris, F., Kummer, K., Brookes, N.B., Liu, X., Sun, Y.-J., Strle, J., Schmitt, T., Braicovich, L., Ghiringhelli, G., Bozovic, I., and Hill, J.P. Sun . "Persistence of mangetic excitations in La{2-x}Sr{x}CuO{4} from the undoped insulator to the heavily overdoped non-superconducting metal". United States. doi:10.1038/NMAT3723.
@article{osti_1160974,
title = {Persistence of mangetic excitations in La{2-x}Sr{x}CuO{4} from the undoped insulator to the heavily overdoped non-superconducting metal},
author = {Dean, M.P.M. and Dellea, G. and Springell, R.S. and Yakhou-Harris, F. and Kummer, K. and Brookes, N.B. and Liu, X. and Sun, Y.-J. and Strle, J. and Schmitt, T. and Braicovich, L. and Ghiringhelli, G. and Bozovic, I. and Hill, J.P.},
abstractNote = {},
doi = {10.1038/NMAT3723},
journal = {Nature Materials},
number = ,
volume = 12,
place = {United States},
year = {Sun Aug 04 00:00:00 EDT 2013},
month = {Sun Aug 04 00:00:00 EDT 2013}
}
  • 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
    Cited by 11
  • 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
  • Magnetic excitations for energies up to {approx}100 meV are studied for overdoped La{sub 2-x}Sr{sub x}CuO{sub 4} with x=0.25 and 0.30, using time-of-flight neutron spectroscopy. Comparison of spectra integrated over the width of an antiferromagnetic Brillouin zone demonstrates that the magnetic scattering at intermediate energies, 20 < or approx. {omega} < or approx. 100 meV, progressively decreases with overdoping. This strongly suggests that the magnetism is not related to Fermi surface nesting, but rather is associated with a decreasing volume fraction of (probably fluctuating) antiferromagnetic bubbles.