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X. T. Li; S. J. Tu; L. Chaix; C. Fawaz; M. d’Astuto; X. Li; F. Yakhou-Harris; K. Kummer; N. B. Brookes; M. Garcia-Fernandez; Ke-Jin Zhou; Z. F. Lin; J. Yuan; K. Jin; M. P. M. Dean; X. Liu

doi:10.1103/PhysRevLett.132.056002

Evolution of the Magnetic Excitations in Electron-Doped ${La}_{2 - x} {Ce}_{x} {CuO}_{4}$

X. T. Li¹, S. J. Tu², L. Chaix ³, C. Fawaz ³, M. d’Astuto ³, X. Li¹, F. Yakhou-Harris⁴, K. Kummer⁴, N. B. Brookes⁴ et al.

M. Garcia-Fernandez⁵, Ke-Jin Zhou ⁵, Z. F. Lin ², J. Yuan², K. Jin², M. P. M. Dean ⁶, and X. Liu ^1,7,*

¹School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
²Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
³Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France
⁴European Synchrotron Radiation Facility (ESRF), B.P. 220, F-38043 Grenoble Cedex, France
⁵Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
⁶Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
⁷Center for Transformative Science, ShanghaiTech University, Shanghai 201210, China

^*liuxr@shanghaitech.edu.cn

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Phys. Rev. Lett. 132, 056002 – Published 1 February, 2024

DOI: https://doi.org/10.1103/PhysRevLett.132.056002

Abstract

We investigated the high energy spin excitations in electron-doped ${La}_{2 - x} {Ce}_{x} {CuO}_{4}$ , a cuprate superconductor, by resonant inelastic x-ray scattering (RIXS) measurements. Efforts were paid to disentangle the paramagnon signal from non-spin-flip spectral weight mixing in the RIXS spectrum at $Q_{∥} = (0.6 π, 0)$ and $(0.9 π, 0)$ along the (1 0) direction. Our results show that, for doping level $x$ from 0.07 to 0.185, the variation of the paramagnon excitation energy is marginal. We discuss the implication of our results in connection with the evolution of the electron correlation strength in this system.

Physical Review Letters

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Evolution of the Magnetic Excitations in Electron-Doped ${La}_{2 - x} {Ce}_{x} {CuO}_{4}$

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Evolution of the Magnetic Excitations in Electron-Doped La2−xCexCuO4

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Evolution of the Magnetic Excitations in Electron-Doped ${La}_{2 - x} {Ce}_{x} {CuO}_{4}$