Persistent spin excitations in doped antiferromagnets revealed by resonant inelastic light scattering

C. J. Jia, E. A. Nowadnick, K. Wohlfeld, Y. F. Kung, C.-C. Chen, S. Johnston, T. Tohyama, B. Moritz and T. P. Devereaux ()
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C. J. Jia: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
E. A. Nowadnick: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
K. Wohlfeld: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
Y. F. Kung: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
C.-C. Chen: Advanced Photon Source, Argonne National Laboratory
S. Johnston: University of British Columbia
T. Tohyama: Yukawa Institute for Theoretical Physics, Kyoto University
B. Moritz: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
T. P. Devereaux: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms4314

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