Magnetic Excitations and Phase Separation in the Underdoped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>Superconductor Measured by Resonant Inelastic X-Ray Scattering

Braicovich, L.; Brink, Jeroen van den; Bisogni, Valentina; Sala, M. Moretti; Ament, L. J. P.; Brookes, N. B.; Luca, G. M. De; Salluzzo, M.; Schmitt, Thorsten; Strocov, Vladimir N.; Ghiringhelli, G.

doi:10.1103/physrevlett.104.077002

Cited by 261 publications

(314 citation statements)

References 20 publications

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“…Figure 1c,d shows spectra of insulating BSYCO, measured along the (100) and (110) high-symmetry directions. The line shapes are similar to those of other insulating cuprates, namely, La 2 CuO 4 (LCO) 24 and Sr 2 CuO 2 Cl 2 (SCOC) 25 . One can identify the elastic peak, broadened by non-resolved phonon sidebands, and a sharp magnon peak, dispersing from zero energy at q ¼ 0 to B0.3 eV at the boundary of the magnetic Brillouin zone (BZ).…”

Section: Resultssupporting

confidence: 55%

“…An independent picture of magnetic and charge excitations has now been gained by resonant inelastic X-ray scattering (RIXS) experiments at the Cu K edge 22 and Cu L 3 edge [23][24][25][26][27][28] in the cuprates and at the Fe L 3 edge in the iron pnictides 29 . RIXS offers some interesting advantages, such as the possibility of measuring small-volume samples, additional flexibility from polarization control and complementary information from the Cu (single magnons) and O (two magnons) edges 30 .…”

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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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Section: Resultssupporting

confidence: 55%

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confidence: 99%

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

et al. 2014

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“…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.…”

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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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“…This is in contrast with cuprates where the spin-wave excitation has clearly been observed in the Cu L-edge RIXS. 20,21 However, since there are remnants of the spin-wave excitation, it may be possible to observe the excitation in RIXS in the near future.…”

Section: Introductionmentioning

confidence: 99%

Spin dynamics and resonant inelastic x-ray scattering in chromium with commensurate spin-density wave order

Sugimoto

Kaneshita

et al. 2013

Phys. Rev. B

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We theoretically investigate spin dynamics and L3-edge resonant inelastic X-ray scattering (RIXS) of Chromium with commensurate spin-density wave (SDW) order, based on a multi-band Hubbard model composed of 3d and 4s orbitals. Obtaining the ground state with the SDW mean-field approximation, we calculate the dynamical transverse and longitudinal spin susceptibility by using random-phase approximation. We find that a collective spin-wave excitation seen in inelastic neutron scattering hardly damps up to ∼0.6 eV. Above the energy, the excitation overlaps individual particlehole excitations as expected, leading to broad spectral weight. On the other hand, the collective spin-wave excitation in RIXS spectra has a tendency to be masked by large spectral weight coming from particle-hole excitations with various orbital channels. This is in contrast with inelastic neutron scattering, where only selected diagonal orbital channels contribute to the spectral weight. However, it may be possible to detect the spin-wave excitation in RIXS experiments in the future if resolution is high enough.

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Magnetic Excitations and Phase Separation in the UnderdopedLa2−xSrxCuO4Superconductor Measured by Resonant Inelastic X-Ray Scattering

Cited by 261 publications

References 20 publications

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

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

Dispersive charge density wave excitations in Bi2Sr2CaCu2O8+δ

Spin dynamics and resonant inelastic x-ray scattering in chromium with commensurate spin-density wave order

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