A high-energy-resolution resonant inelastic X-ray scattering spectrometer at ID20 of the European Synchrotron Radiation Facility

Sala, M. Moretti; Martel, K.; Henriquet, C.; Zein, A.; Simonelli, Laura; Sahle, Christoph J.; Gonzalez, Hervé; Lagier, Michel; Ponchut, C.; Huotari, Simo; Verbeni, R.; Krisch, M.; Monaco, G.

doi:10.1107/s1600577518001200

Cited by 72 publications

(27 citation statements)

References 91 publications

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“…The magnetization measurements were performed using a commercial superconducting quantum interference device magnetometer (MPMS SQUID VSM, Quantum Design). Figure S1 shows resonant inelastic x-ray scattering (RIXS) data for (a) the in-plane magnetic excitation in Sr 2 IrO 4 (reproduced from Fig.12 in the main text) measured at Q = (3 2 28.2) and (b) in-plane and out-of-plane magnetic excitations measured at ID20 in ESRF [49] at the almost equivalent position Q = (32 28.5). Due to the incident polarization directions differing in the crystal frame (see next section), the two measurements have different sensitivity to in-plane and out-plane excitations.…”

Section: Discussionmentioning

confidence: 99%

Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4

et al. 2019

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Spin-orbit entangled magnetic dipoles, often referred to as pseudospins, provide a new avenue to explore novel magnetism inconceivable in the weak spin-orbit coupling limit, but the nature of their low-energy interactions remains to be understood. We present a comprehensive study of the static magnetism and low-energy pseudospin dynamics in the archetypal spin-orbit Mott insulator Sr2IrO4. We find that in order to understand even basic magnetization measurements, a formerly overlooked in-plane anisotropy is fundamental. In addition to magnetometry, we use neutron diffraction, inelastic neutron scattering and resonant elastic and inelastic x-ray scattering to identify and quantify the interactions that determine the global symmetry of the system and govern the linear responses of pseudospins to external magnetic fields and their low-energy dynamics. We find that a pseudospin-only Hamiltonian is insufficient for an accurate description of the magnetism in Sr2IrO4 and that pseudospin-lattice coupling is essential. This finding should be generally applicable to other pseudospin systems with sizable orbital moments sensitive to anisotropic crystalline environments.

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Section: Discussionmentioning

confidence: 99%

Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4

et al. 2019

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“…The samples were initially characterized using magnetometry and resonant x-ray diffraction [22]. RIXS measurements were conducted using beamlines ID20 at ESRF, France [23] and 27-ID at the Advanced Photon Source (APS), Argonne, IL, USA [24], in a Rowland geometry configuration with a Si(844) diced spherical analyzer, giving an overall energy resolution of E ≈ 25 meV. Samples were mounted in a (100) × (001) scattering geometry (in orthorhombic notation) and measured at T = 10 K.…”

Section: Methodsmentioning

confidence: 99%

Spin-wave gap collapse in Rh-doped Sr2IrO4

et al. 2020

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We use resonant inelastic x-ray scattering (RIXS) at the Ir L 3 edge to study the effect of hole doping upon the J eff = 1 2 Mott-insulating state in Sr 2 IrO 4 , via Rh replacement of the Ir site. The spin-wave gap, associated with XY-type spin-exchange anisotropy, collapses with increasing Rh content, prior to the suppression of the Mott-insulating state and in contrast to electron doping via La substitution of the Sr site. At the same time, despite heavy damping, the d-d excitation spectra retain their overall amplitude and dispersion character. A careful study of the spin-wave spectrum reveals that deviations from the J 1 -J 2 -J 3 Heisenberg used to model the pristine system disappear at intermediate doping levels. These findings are interpreted in terms of a modulation of Ir-Ir correlations due to the influence of Rh impurities upon nearby Ir wave functions, even as the single-band J eff = 1 2 model remains valid up to full carrier delocalization. They underline the importance of the transition metal site symmetry when doping pseudospin systems such as Sr 2 IrO 4 .

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“…θ and χ with rotation axes in and perpendicular to the Rowland circle). In previous multianalyser spectrometers, this was achieved by piling-up multistages with each crystal 39 . We dismissed this solution because of space constraints and costs.…”

Section: A Analyser Tablementioning

confidence: 99%

TEXS: in-vacuum tender X-ray emission spectrometer with 11 Johansson crystal analyzers

Rovezzi¹,

Harris²,

Detlefs³

et al. 2020

J Synchrotron Rad

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We describe the design and show first results of a large solid angle x-ray emission spectrometer that is optimised for energies between 5.5 keV and 1.5 keV. The spectrometer is based on an array of eleven cylindrically bent Johansson crystal analysers arranged in a point-to-point Rowland circle geometry. The smallest achievable energy bandwidth is smaller than the core hole lifetime broadening of the absorption edges in this energy range. Energy scanning is achieved using an innovative design, maintaining the Rowland circle conditions for all crystals with only four motor motions. The entire spectrometer is encased in a high-vacuum chamber that allows fitting a liquid helium cryostat and provides sufficient space for in situ cells and operando catalysis reactors.

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A high-energy-resolution resonant inelastic X-ray scattering spectrometer at ID20 of the European Synchrotron Radiation Facility

Cited by 72 publications

References 91 publications

Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4

Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4

Spin-wave gap collapse in Rh-doped Sr2IrO4

TEXS: in-vacuum tender X-ray emission spectrometer with 11 Johansson crystal analyzers

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