@article{98e3a57e9abb4656afd0eb1e903bd133,
title = "Persistent spin excitations in doped antiferromagnets revealed by resonant inelastic light scattering",
abstract = "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 L3-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 Tc, 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.",
author = "Jia, \{C. J.\} and Nowadnick, \{E. A.\} and K. Wohlfeld and Kung, \{Y. F.\} and Chen, \{C. C.\} and S. Johnston and T. Tohyama and B. Moritz and Devereaux, \{T. P.\}",
note = "Funding Information: We thank G. Ghiringhelli, R. Hackl, J. P. Hill, B. J. Kim, M. Le Tacon, W.-S. Lee and J. Tranquada for discussions. This work was supported at SLAC and Stanford University by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering, under Contract No. DE-AC02-76SF00515 and by the Computational Materials and Chemical Sciences Network (CMCSN) under Contract No. DE-SC0007091. C.J.J. is also supported by the Stanford Graduate Fellows in Science and Engineering. C.-C.C. is supported by the Aneesur Rahman Postdoctoral Fellowship at Argonne National Laboratory, operated under the U.S. Department of Energy Contract No. DE-AC02-06CH11357. T.T. is supported by the Grant-in-Aid for Scientific Research (Grant No. 22340097) and Strategic Programs for Innovative Research (SPIRE), the Computational Materials Science Initiative (CMSI) from MEXT. Y.F.K. was supported by the National Science Foundation Graduate Research Fellowship under Grant No. 1147470. T.T. and T.P.D. acknowledge the YIPQS program of YITP, Kyoto University. A portion of the computational work was performed using the resources of the National Energy Research Scientific Computing Center (NERSC) supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-05CH11231.",
year = "2014",
month = feb,
day = "28",
doi = "10.1038/ncomms4314",
language = "English (US)",
volume = "5",
journal = "Nature communications",
issn = "2041-1723",
publisher = "Nature Research",
}