Journal
NATURE COMMUNICATIONS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms4314
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-AC02-76SF00515]
- Computational Materials and Chemical Sciences Network (CMCSN) [DE-SC0007091]
- Aneesur Rahman Postdoctoral Fellowship at Argonne National Laboratory, operated under the U.S. Department of Energy [DE-AC02-06CH11357]
- Strategic Programs for Innovative Research (SPIRE)
- MEXT
- National Science Foundation Graduate Research Fellowship [1147470]
- U.S. Department of Energy, Office of Science [DE-AC02-05CH11231]
- [22340097]
- Grants-in-Aid for Scientific Research [22340097] Funding Source: KAKEN
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How coherent quasiparticles emerge by doping quantum antiferromagnets is a key question in correlated electron systems, whose resolution is needed to elucidate the phase diagram of copper oxides. Recent resonant inelastic X-ray scattering (RIXS) experiments in hole-doped cuprates have purported to measure high-energy collective spin excitations that persist well into the overdoped regime and bear a striking resemblance to those found in the parent compound, challenging the perception that spin excitations should weaken with doping and have a diminishing effect on superconductivity. Here we show that RIXS at the Cu L-3-edge indeed provides access to the spin dynamical structure factor once one considers the full influence of light polarization. Further we demonstrate that high-energy spin excitations do not correlate with the doping dependence of T-c, while low-energy excitations depend sensitively on doping and show ferromagnetic correlations. This suggests that high-energy spin excitations are marginal to pairing in cuprate superconductors.
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