High-energy magnetic excitations in overdoped La2-xSrxCuO4 studied by neutron and resonant inelastic X-ray scattering

Wakimoto, S.; Ishii, K.; Kimura, H.; Fujita, M.; Dellea, G.; Kummer, K.; Braicovich, L.; Ghiringhelli, G.; Debeer-Schmitt, Lisa M.; Granroth, Garrett E.

doi:10.1103/PhysRevB.91.184513

Title: High-energy magnetic excitations in overdoped La_2-xSr_xCuO₄ studied by neutron and resonant inelastic X-ray scattering

Journal Article · Thu May 21 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.184513· OSTI ID:1185935

Wakimoto, S. ^[1]; Ishii, K. ^[2]; Kimura, H. ^[3]; Fujita, M. ^[4]; Dellea, G. ^[5]; Kummer, K. ^[6]; Braicovich, L. ^[5]; Ghiringhelli, G. ^[5]; Debeer-Schmitt, Lisa M. ^[7]; Granroth, Garrett E. ^[8]

Japan Atomic Energy Agency (JAEA), Tokai (Japan). Quantum Beam Science Center
Japan Atomic Energy Agency (JAEA), Hyogo (Japan). SPring-8
Tohoku Univ., Sendai (Japan). Inst. for Multidisciplinary Research for Advanced Materials
Tohoku Univ., Sendai (Japan). Inst. for Materials Research
Politecnico di Milano (Italy). CNR-SPIN and Physics Dept.
European Synchrotron Radiation Facility (ESRF), Grenoble (France)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Instrument and Source Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division

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 is 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. 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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; 25390132; 35400333; 24340064

OSTI ID:: 1185935

Alternate ID(s):: OSTI ID: 1182450

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 18; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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References (26)

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Theory of angle-dependent marginal Fermi liquid self-energy and its existence at all dopings in cuprates Ray, Sujay; Das, Tanmoy Journal of Physics: Condensed Matter, Vol. 31, Issue 36 https://doi.org/10.1088/1361-648x/ab25b8	journal	June 2019
Damped spin excitations in a doped cuprate superconductor with orbital hybridization Ivashko, O.; Shaik, N. E.; Lu, X. American Physical Society https://doi.org/10.5167/uzh-141661	text	January 2017
Decrease of d-wave pairing strength in spite of the persistence of magnetic excitations in the overdoped Hubbard model Huang, Edwin W.; Scalapino, Douglas J.; Maier, Thomas A. arXiv https://doi.org/10.48550/arxiv.1705.03949	text	January 2017

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Title: High-energy magnetic excitations in overdoped La_2-xSr_xCuO₄ studied by neutron and resonant inelastic X-ray scattering