Development of the Soft X-ray AGM-AGS RIXS Beamline at Taiwan Photon Source

Abstract

We report on the development of a high-resolution and highly efficient beamline for soft-X-ray resonant inelastic X-ray scattering (RIXS) located at Taiwan Photon Source. This beamline adopts an optical design that uses an active grating monochromator (AGM) and an active grating spectrometer (AGS) to implement the energy compensation principle of grating dispersion. Active gratings are utilized to diminish defocus, coma and higher-order aberrations as well as to decrease the slope errors caused by thermal deformation and optical polishing. The AGS is mounted on a rotatable granite platform to enable momentum-resolved RIXS measurements with scattering angle over a wide range. Several high-precision instruments developed in house for this beamline are briefly described. The best energy resolution obtained from this AGM-AGS beamline was 12.4 meV at 530 eV, achieving a resolving power 42,000, while the bandwidth of the incident soft X-rays was kept at 0.5 eV. To demonstrate the scientific impacts of high-resolution RIXS, we present an example of momentum-resolved RIXS measurements on a high-temperature superconducting cuprate, La${}_{2-x}$Sr${}_x$CuO${}_4$. The measurements reveal the A${}_{1g}$ apical oxygen phonons in superconducting cuprates, opening a new opportunity to investigate the coupling between these phonons and charge density waves.

arXiv comment9 pages, p figures, submitted to J. of Synchrotron Radiation. Revise expression

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• Jahn-Teller distortion driven magnetic polarons in magnetite
• Coulomb correlations intertwined with spin and orbital excitations in LaCoO${}_3$
• Raman and fluorescence characteristics of resonant inelastic X-ray scattering from doped superconducting cuprates
• Orbital engineering in nickelate heterostructures driven by anisotropic oxygen hybridization rather than orbital energy levels
• Selective formation of apical oxygen vacancies in La${}_{2-x}$Sr${}_x$CuO${}_4$
• Superconducting pairing and the pseudogap in nematic striped La2-xSrxCuO4

Cited by in corpus (16)

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• Spin Excitations and Flat Electronic Bands in a Cr-based Kagome Superconductor
• Low temperature dynamic polaron liquid in a manganite exhibiting colossal magnetoresistance
• Giant X-ray circular dichroism in a time-reversal invariant altermagnet
• Out-of-phase Plasmon Excitations in the Trilayer Cuprate Bi${}_2$Sr${}_2$Ca${}_2$Cu${}_3$O${}_{10+\delta }$
• Quantum fluctuations of charge order induce phonon softening in a superconducting cuprate
• Table-top interferometry on extreme time and wavelength scales
• Spin-orbit-entangled electronic structure of Ba${}_2$CaOsO${}_6$ studied by O $K$-edge resonant inelastic X-ray scattering
• A compact approach to higher-resolution resonant inelastic X-ray scattering detection using photoelectrons
• Distinct orbital contributions to electronic and magnetic structures in La${}_4$Ni${}_3$O${}_{10}$
• Polarization dependency in Resonant Inelastic X-Ray Scattering
• Bimagnon dispersion of La2CuO4 probed by resonant inelastic X-ray scattering
• Electronic Energy Scales of Cr$X_3$ ($X$ = Cl, Br, and I) using High-resolution X-ray Scattering