High-resolution soft X-ray beamline ADRESS at the Swiss Light Source for resonant inelastic X-ray scattering and angle-resolved photoelectron spectroscopies

Strocov, Vladimir N.; Schmitt, Thorsten; Flechsig, U.; Schmidt, Th.; Imhof, A.; Chen, Q.; Raabe, Jörg; Betemps, R.; Zimoch, D.; Krempaský, Juraj; Wang, X.; Grioni, M.; Piazzalunga, A.; Patthey, L.

doi:10.1107/s0909049510019862

Cited by 351 publications

(309 citation statements)

References 22 publications

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“…The RIXS experiment was carried out at the Advanced Resonant Spectroscopies (ADRESS) beamline [16,17] at the Swiss Light Source (SLS) with the geometry shown in Fig. 1(h).…”

Section: Methodsmentioning

confidence: 99%

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Ivashko

Shaik

et al. 2017

Phys. Rev. B

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A resonant inelastic x-ray scattering study of overdamped spin excitations in slightly underdoped La 2−x Sr x CuO 4 (LSCO) with x = 0.12 and 0.145 is presented. Three high-symmetry directions have been investigated: (1) the antinodal (0,0) → ( 1 2 ,0), (2) the nodal (0,0) → ( 1 4 , 1 4 ), and (3) the zone-boundary direction ( 1 2 ,0) → ( 1 4 , 1 4 ) connecting these two. The overdamped excitations exhibit strong dispersions along (1) and (3), whereas a much more modest dispersion is found along (2). This is in strong contrast to the undoped compound La 2 CuO 4 (LCO) for which the strongest dispersions are found along (1) and (2). The t − t − t − U Hubbard model used to explain the excitation spectrum of LCO predicts-for constant U/t-that the dispersion along (3) scales with (t /t) 2 . However, the diagonal hopping t extracted on LSCO using single-band models is low (t /t ∼ −0.16) and decreasing with doping. We therefore invoked a two-orbital (d x 2 −y 2 and d z 2 ) model which implies that t is enhanced. This effect acts to enhance the zone-boundary dispersion within the Hubbard model. We thus conclude that hybridization of d x 2 −y 2 and d z 2 states has a significant impact on the zone-boundary dispersion in LSCO.

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“…The RIXS experiment was carried out at the Advanced Resonant Spectroscopies (ADRESS) beamline [16,17] at the Swiss Light Source (SLS) with the geometry shown in Fig. 1(h).…”

Section: Methodsmentioning

confidence: 99%

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Ivashko

Shaik

et al. 2017

Phys. Rev. B

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“…RIXS measurements at the Cu L 3 absorption edge (2p 3/2 -3d; Fig. 1a) were performed with the SAXES spectrometer 40 of the ADRESS beam line 41 at the Swiss Light Source, Paul Scherrer Institut (Villigen, Switzerland). The soft X-ray beam from the undulator source was linearly polarized either within (p polarization) or perpendicular to (s polarization) the horizontal scattering plane.…”

Section: Discussionmentioning

confidence: 99%

Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates

et al. 2014

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The high-T c cuprate superconductors are close to antiferromagnetic order. Recent measurements of magnetic excitations have reported an intriguing similarity to the spin wavesmagnons-of the antiferromagnetic insulating parent compounds, suggesting that magnons may survive in damped, broadened form throughout the phase diagram. Here we show by resonant inelastic X-ray scattering on Bi 2 Sr 2 CaCu 2 O 8 þ d (Bi-2212) that the analogy with spin waves is only partial. The magnon-like features collapse along the nodal direction in momentum space and exhibit a photon energy dependence markedly different from the Mott-insulating case. These observations can be naturally described by the continuum of charge and spin excitations of correlated electrons. The persistence of damped magnons could favour scenarios for superconductivity built from quasiparticles coupled to spin fluctuations. However, excitation spectra composed of particle-hole excitations suggest that superconductivity emerges from a coherent treatment of electronic spin and charge in the form of quasiparticles with very strong magnetic correlations.

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“…The low energy-resolution RIXS data on the UD-NBCO (Nd 1.2 Ba 1.8 Cu 3 O 6+δ ) sample were taken at the ADRESS beamline of the Swiss Light Source at the Paul Scherrer Institut (PSI, Switzerland) using the SAXES spectrometer 32,33 . The RIXS spectra were measured at T = 60 K, just below T c = 65 K to maximize the CDW peak intensity, and using linear vertical (σ ) polarized incident photons.…”

Section: Author Contributionsmentioning

confidence: 99%

Dispersive charge density wave excitations in Bi2Sr2CaCu2O8+δ

et al. 2017

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Experimental evidence on high-T c cuprates reveals ubiquitous charge density wave (CDW) modulations 1-10 , which coexist with superconductivity. Although the CDW had been predicted by theory 11-13 , important questions remain about the extent to which the CDW influences lattice and charge degrees of freedom and its characteristics as functions of doping and temperature. These questions are intimately connected to the origin of the CDW and its relation to the mysterious cuprate pseudogap 10,14 . Here, we use ultrahigh-resolution resonant inelastic X-ray scattering to reveal new CDW character in underdoped Bi 2.2 Sr 1.8 Ca 0.8 Dy 0.2 Cu 2 O 8+δ . At low temperature, we observe dispersive excitations from an incommensurate CDW that induces anomalously enhanced phonon intensity, unseen using other techniques. Near the pseudogap temperature T * , the CDW persists, but the associated excitations significantly weaken with an indication of CDW wavevector shift. The dispersive CDW excitations, phonon anomaly, and analysis of the CDW wavevector provide a comprehensive momentumspace picture of complex CDW behaviour and point to a closer relationship with the pseudogap state.With sufficient energy resolution, resonant inelastic X-ray scattering (RIXS) can be an ideal probe for revealing the CDW excitations in cuprates. By tuning the incident photon energy to the Cu L 3 -edge (Fig. 1a), the resonant absorption and emission processes can leave the system in excited final states, which couple to a variety of excitations arising from orbital, spin, charge, and lattice degrees of freedom 15 . Thus, information of these elementary excitations in energy and momentum space can be deduced from analysing the RIXS spectra as functions of the energy loss and the momentum transfer of the photons (Fig. 1a). This is highlighted by the pivotal role that RIXS has recently played in revealing orbital and magnetic excitations in cuprates [16][17][18][19][20] . In addition, RIXS provided the first X-ray scattering evidence for an incommensurate CDW in (Y,Nd)Ba 2 Cu 3 O 6+δ (ref. 4), owing to energy resolution that separated the quasi-elastic CDW signal (bright spot in Fig. 1b, limited by the instrumental resolution ∼130 meV) from other intense higher-energy excitations. Notably this quasi-elastic signal is asymmetric with respect to zero energy loss (Fig. 1c), which indicates the possible existence of additional low-energy excitations near the CDW wavevector (Q CDW ).In this work, we exploit the newly commissioned ultrahighresolution RIXS instrument at the European Synchrotron Radiation Facility to reveal these low-energy excitations near the CDW. We choose the double-layer cuprate Bi 2.2 Sr 1.8 Ca 0.8 Dy 0.2 Cu 2 O 8+δ (Bi2212), whose electronic structure has been extensively studied by surface-sensitive spectroscopy, such as scanning tunnelling microscopy 21 and angle-resolved photoemission 22 , and in which a short-range CDW order was recently reported 7,8 . With improved energy resolution up to 40 meV, we see additional features in the pre...

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High-resolution soft X-ray beamline ADRESS at the Swiss Light Source for resonant inelastic X-ray scattering and angle-resolved photoelectron spectroscopies

Cited by 351 publications

References 22 publications

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates

Dispersive charge density wave excitations in Bi2Sr2CaCu2O8+δ

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