Raman and fluorescence characteristics of resonant inelastic X-ray scattering from doped superconducting cuprates

Scientific Reports
H Y HuangD J Huang

Abstract

Measurements of spin excitations are essential for an understanding of spin-mediated pairing for superconductivity; and resonant inelastic X-ray scattering (RIXS) provides a considerable opportunity to probe high-energy spin excitations. However, whether RIXS correctly measures the collective spin excitations of doped superconducting cuprates remains under debate. Here we demonstrate distinct Raman- and fluorescence-like RIXS excitations of Bi1.5Pb0.6Sr1.54CaCu2O8+δ. Combining photon-energy and momentum dependent RIXS measurements with theoretical calculations using exact diagonalization provides conclusive evidence that the Raman-like RIXS excitations correspond to collective spin excitations, which are magnons in the undoped Mott insulators and evolve into paramagnons in doped superconducting compounds. In contrast, the fluorescence-like shifts are due primarily to the continuum of particle-hole excitations in the charge channel. Our results show that under the proper experimental conditions RIXS indeed can be used to probe paramagnons in doped high-Tc cuprate superconductors.

References

Sep 26, 2012·Physical Review Letters·Pasquale MarraJeroen van den Brink

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Citations

Jul 1, 2017·Nature Communications·H Y HuangD J Huang
Aug 5, 2017·Physical Review Letters·Mehmet Emre Tasgin
Sep 17, 2016·Physical Review Letters·H GretarssonB J Kim
Jun 8, 2019·Physical Review Letters·Chen-Yen Lai, Jian-Xin Zhu
Aug 3, 2017·The Review of Scientific Instruments·Yu HeZhi-Xun Shen
May 6, 2021·Journal of Synchrotron Radiation·A SinghC T Chen

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Methods Mentioned

BETA
X-ray

Software Mentioned

RIXS
Parallel Arnoldi Package ( PARPACK )

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