Resonant elastic soft x-ray scattering

Fink, J.; Schierle, E.; Weschke, E.; Geck, J.

doi:10.1088/0034-4885/76/5/056502

Cited by 163 publications

(123 citation statements)

References 326 publications

(634 reference statements)

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“…We extend previous studies on stripe ordered cuprates and report resonant soft x-ray scattering (RSXS) [21] measurements on LESCO exposed to a magnetic field. LESCO undergoes a structural phase transition from an orthorhombic (LTO) to a tetragonal (LTT) phase at T LT T ≈ 130 K and, while LSCO shows superconductivity with T c ≈ 30 K [22], LESCO only becomes superconducting at T c ≈ 5K for our Sr content [3].…”

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confidence: 63%

Stripe order of La1.64Eu0.2Sr0.16CuO4 in magnetic fields studied by resonant soft x-ray scattering

et al. 2016

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We present results on the magnetic field dependence of the stripe order in La 1.64 Eu 0.2 Sr 0.16 CuO 4 (LESCO). Using resonant soft x-ray scattering at the oxygen K-edge to probe the (0.259,0,0.648) superlattice reflection, which is commonly associated to charge stripes, we found no pronounced difference in the wave vector, peak widths and integrated intensity for magnetic fields up to B = 6 T. This is in strong contrast to the behavior observed for La 1.875 Sr 0.125 CuO 4 , where a stabilization of the charge modulation in high magnetic fields has been demonstrated.

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confidence: 63%

Stripe order of La1.64Eu0.2Sr0.16CuO4 in magnetic fields studied by resonant soft x-ray scattering

et al. 2016

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“…For more details, see the recent review in Ref. 57. The resonant scattering intensity I(ω) depends on the incoming photon energy, ω, and can be described as…”

Section: Resonant X-ray Scatteringmentioning

confidence: 99%

Resonant x-ray scattering study of charge-density wave correlations inYBa2Cu3O6+x

et al. 2014

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We report the results of a comprehensive study of charge density wave (CDW) correlations in untwinned YBa2Cu3O6+x single crystals with 0.4 ≤ x ≤ 0.99 using Cu-L3 edge resonant x-ray scattering (RXS). Evidence of CDW formation is found for 0.45 ≤ x ≤ 0.93 (hole doping levels 0.086 p 0.163), but not for samples with x ≤ 0.44 (p 0.084) that exhibit incommensurate spin-density-wave order, and in slightly overdoped samples with x = 0.99 (p ∼ 0.19). This suggests the presence of two proximate zero-temperature CDW critical points at pc1 ∼ 0.08 and pc2 ∼ 0.18. Remarkably, pc2 is close to the doping level that is optimal for superconductivity. The CDW reflections are observed at incommensurate in-plane wave vectors (δa, 0) and (0, δ b ) with δa δ b . Both δa and δ b decrease linearly with increasing doping, in agreement with recent reports on Bibased high-Tc superconductors, but in sharp contrast to the behavior of the La2−x(Ba,Sr)xCuO4 family. The CDW intensity and correlation length exhibit maxima at p ∼ 0.12, coincident with a plateau in the superconducting transition temperature Tc. The onset temperature of the CDW reflections depends non-monotonically on p, with a maximum of ∼ 160 K for p ∼ 0.12. The RXS reflections exhibit a uniaxial intensity anisotropy. Whereas in strongly underdoped samples the reflections at (δa, 0) are much weaker than those at (0, δ b ), the anisotropy is minimal for p ∼ 0.12, and reversed close to optimal doping. We further observe a depression of CDW correlations upon cooling below Tc, and (for samples with p ≥ 0.09) an enhancement of the signal when an external magnetic field up to 6 T is applied in the superconducting state. For samples with p ∼ 0.08, where prior work has revealed a field-enhancement of incommensurate magnetic order, the RXS signal is field-independent. This supports a previously suggested scenario in which incommensurate charge and spin orders compete against each other, in addition to individually competing against superconductivity (Blanco-Canosa et al., Phys. Rev. Lett. 110, 187001 (2013)). We discuss the relationship of these results to prior observations of "stripe" order in La2−x(Ba,Sr)xCuO4, the "pseudogap" phenomenon, superconducting fluctuations, and quantum oscillations, as well as their implications for the mechanism of high-temperature superconductivity.

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“…In principle, RXES combines the aspects of simultaneous probing of occupied and unoccupied electronic states in a single experimental approach. In general two X-ray scattering processes may be distinguished for resonant X-ray-matter interaction: Resonant elastic X-ray scattering (REXS) [65,66] and Resonant inelastic X-ray scattering (RIXS) [67,68]. The REXS process delivers information on the spatial modulations of charge, spin and orbital degrees of freedom, whereas the RIXS process provides data on the density of unoccupied electronic states and the geometric orientation of the interacting atoms.…”

Section: Introductionmentioning

confidence: 99%

High energy resolution off-resonant spectroscopy: A review

Błachucki

Hoszowska

Dousse

et al. 2017

Spectrochimica Acta Part B: Atomic Spectroscopy

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We review the high energy resolution off-resonant spectroscopy (HEROS) technique. HEROS probes the unoccupied electronic states of matter in a single-shot manner thanks to the combination of off-resonant excitation around atomic core states using wavelength dispersive X-ray detection setups. In this review we provide a general introduction to the field of X-ray spectroscopy together with the specification of the available X-ray techniques and X-ray methodologies. Next, the theoretical description of the HEROS approach is introduced with a special focus on the derivation of the X-ray emission and X-ray absorption correspondence relation at off-resonant excitation conditions. Finally, a number of experimental HEROS reports are reviewed in the field of chemistry and material science. We emphasize the applicability of HEROS to pulsed X-ray sources, like X-ray free electron lasers, and support the review with experimental examples. The review is complemented with perspectives on and possible further applications of the HEROS technique to the field of X-ray science.

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Resonant elastic soft x-ray scattering

Cited by 163 publications

References 326 publications

Stripe order of La1.64Eu0.2Sr0.16CuO4 in magnetic fields studied by resonant soft x-ray scattering

Stripe order of La1.64Eu0.2Sr0.16CuO4 in magnetic fields studied by resonant soft x-ray scattering

Resonant x-ray scattering study of charge-density wave correlations inYBa2Cu3O6+x

High energy resolution off-resonant spectroscopy: A review

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