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Resonant inelastic x-ray scattering studies of magnons and bimagnons in the lightly doped cuprate La2-x SrxCuO4

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [2];  [4];  [4];  [2];  [5];  [6];  [4];  [2];  [7];  [4];  [7];  [2]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Univ. Paris-Saclay, Gif-sur-Yvette (France). Leon Brillouin Lab. (LLB), CEA/CNRS
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  3. Paul Scherrer Inst. (PSI), Villigen (Switzerland). SwissFEL and Lab. for Micro and Nanotechnology
  4. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Swiss Light Source
  5. Univ. of Perpignan (France). Lab. of Processes, Materials and Solar Energy, Promes-CNRS
  6. Technion-Israel Inst. of Tech., Haifa (Israel). Dept. of Physics
  7. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
Here, we investigated the doping dependence of magnetic excitations in the lightly doped cuprate La2-xSrxCuO4 via combined studies of resonant inelastic x-ray scattering (RIXS) at the Cu L3 edge and theoretical calculations. With increasing doping, the magnon dispersion is found to be essentially unchanged, but the spectral width broadens and the spectral weight varies differently at different momenta. Near the Brillouin zone center, we directly observe bimagnon excitations that possess the same energy scale and doping dependence as previously observed by Raman spectroscopy. They disperse weakly in energy-momentum space, and they are consistent with a bimagnon dispersion that is renormalized by the magnon-magnon interaction at the zone center.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1438550
Alternate ID(s):
OSTI ID: 1434196
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 15 Vol. 97; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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