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The influence of phonon symmetry and electronic structure on the electron-phonon coupling momentum dependence in cuprates
Maryia Zinouyeva, Rolf Heid, Giacomo Merzoni +16
The experimental determination of the magnitude and momentum dependence of electron-phonon coupling (EPC) is an outstanding problem in condensed matter physics. The intensity of ph…
Spin excitations in Nd1-xSrxNiO2 and YBa2Cu3O7-delta: the influence of Hubbard U
Francesco Rosa, Leonardo Martinelli, Guillaume Krieger +10
We use Resonant Inelastic X-ray Scattering (RIXS) to compare the doping dependence of magnetic excitations of an Infinite-Layer nickelate to those of a prototypical superconducting…
Collective nature of orbital excitations in layered cuprates in the absence of apical oxygens
Leonardo Martinelli, Krzysztof Wohlfeld, Jonathan Pelliciari +19
We have investigated the 3d orbital excitations in CaCuO2 (CCO), Nd2CuO4 (NCO), and La2CuO4 (LCO) using high-resolution resonant inelastic x-ray scattering. In LCO they behave as w…
Fractional spin excitations in the infinite-layer cuprate CaCuO
Leonardo Martinelli, Davide Betto, Kurt Kummer +6
We use resonant inelastic x-ray scattering (RIXS) to investigate the magnetic dynamics of the infinite-layer cuprate CaCuO2. We find that close to the (1/2,0) point the single magn…
Large polarons as key quasiparticles in SrTiO3 and SrTiO3-based heterostructures
Andrey Geondzhian, Alessia Sambri, Gabriella M. De Luca +11
Despite its simple structure and low degree of electronic correlation, SrTiO (STO) features collective phenomena linked to charge transport and, ultimately, superconductivity,…
Mobile orbitons in CaCuO: crucial role of the Hund's exchange
Roberto Fumagalli, Jonas Heverhagen, Davide Betto +9
We investigate the Cu edge resonant inelastic x-ray scattering (RIXS) spectra of a quasi-1D antiferromagnet CaCuO. In addition to the magnetic excitations, which are…
Dispersive charge density wave excitations and temperature dependent commensuration in Bi2Sr2CaCu2O8+δ
Laura Chaix, Giacomo Ghiringhelli, Yingying Peng +14
Experimental evidence on high-Tc cuprates reveals ubiquitous charge density wave (CDW) modulations, which coexist with superconductivity. Although the CDW had been predicted by the…
Directly characterizing the relative strength and momentum dependence of electron-phonon coupling using resonant inelastic x-ray scattering
T. P. Devereaux, A. M. Shvaika, K. Wu +9
The coupling between lattice and charge degrees of freedom in condensed matter materials is ubiquitous and can often result in interesting properties and ordered phases, including…
Femtosecond dynamics of magnetic excitations from resonant inelastic x-ray scattering in CaCu2O3
Valentina Bisogni, Stefanos Kourtis, Claude Monney +10
Taking spinon excitations in the quantum antiferromagnet CaCu2O3 as an example, we demonstrate that femtosecond dynamics of magnetic excitations can be probed by direct resonant in…
Dispersive spin excitations in highly overdoped cuprates revealed by resonant inelastic x-ray scattering
M. Le Tacon, M. Minola, D. C. Peets +11
Using resonant inelastic x-ray scattering (RIXS) at the Cu -absorption edge, we have observed intense, dispersive spin excitations in highly overdoped TlBaCuO (s…
Long-range incommensurate charge fluctuations in (Y,Nd)Ba2Cu3O(6+x)
G. Ghiringhelli, M. Le Tacon, M. Minola +17
There are increasing indications that superconductivity competes with other orders in cuprate superconductors, but obtaining direct evidence with bulk-sensitive probes is challengi…
BaVS probed by V L edge X-ray absorption spectroscopy
V. Ilakovac, N. B. Brookes, J. Criginski Cezar +10
Polarization dependent vanadium L edge X-ray absorption spectra of BaVS single crystals are measured in the four phases of the compound. The difference between signals with the…
Measurement of magnetic excitations in the two-dimensional antiferromagnetic Sr2CuO2Cl2 insulator using resonant x-ray scattering:Evidence for extended interactions
M. Guarise, B. Dalla Piazza, M. Moretti Sala +13
Using high-resolution resonant inelastic x-ray scattering (RIXS), we performed a momentum-resolved study of magnetic excitations in the model spin-1/2 2D antiferromagnetic insulato…
Momentum dependence of orbital excitations in Mott-insulating titanates
C. Ulrich, L. J. P. Ament, G. Ghiringhelli +9
High-resolution resonant inelastic x-ray scattering has been used to determine the momentum dependence of orbital excitations in Mott-insulating LaTiO and YTiO over a wide…
Orbital occupation, atomic moments and magnetic ordering at interfaces of manganite thin films
C. Aruta, G. Ghiringhelli, V. Bisogni +4
We have performed x-ray linear and circular magnetic dichroism experiments at the Mn L2,3-edge of the La0.7Sr0.3MnO3 ultra thin films. Our measurements show that the antiferromagne…
Resonant X-rays at the Cu L-edge as a momentum dependent probe of the magnetic excitation spectrum in cuprates
L. J. P. Ament, G. Ghiringhelli, M. Moretti Sala +2
We show that, contrary to common lore, in resonant inelastic x-ray scattering (RIXS) at the copper L- and M-edge direct spin-flip scattering is in principle allowed. We demonstrate…
Collective spin excitations in a quantum spin ladder probed by high-resolution Resonant Inelastic X-ray Scattering
J. Schlappa, T. Schmitt, F. Vernay +13
We investigate magnetic excitations in the spin-ladder compound SrCuO using high-resolution Cu -edge Resonant Inelastic X-ray Scattering (RIXS). Our findi…
Dispersing bimagnons and doping induced bimagnon-charge modes in superconducting cuprates
L. Braicovich, L. J. P. Ament, V. Bisogni +11
In the early days of high temperature superconductivity it was already recognized that magnetic properties of these materials are intimately related to the superconducting ones . W…
Evidence of orbital reconstruction at interfaces in La0.67Sr0.33MnO3 films
A Tebano, C. Aruta, S. Sanna +8
Electronic properties of transition metal oxides at interfaces are influenced by strain, electric polarization and oxygen diffusion. Linear dichroism (LD) x-ray absorption, diffrac…