Two-spinon and orbital excitations of the spin-Peierls system TiOCl.

  title={Two-spinon and orbital excitations of the spin-Peierls system TiOCl.},
  author={Sven Glawion and Jakoba Heidler and Maurits W. Haverkort and Laurent C. Duda and Thorsten Schmitt and Vladimir N. Strocov and Claude Monney and K. J. Zhou and A. Ruff and Michael Sing and Ralph Claessen},
  journal={Physical review letters},
  volume={107 10},
We combine high-resolution resonant inelastic x-ray scattering with cluster calculations utilizing a recently derived effective magnetic scattering operator to analyze the polarization, excitation energy, and momentum-dependent excitation spectrum of the low-dimensional quantum magnet TiOCl in the range expected for orbital and magnetic excitations (0-2.5 eV). Ti 3d orbital excitations yield complete information on the temperature-dependent crystal-field splitting. In the spin-Peierls phase we… 

Figures from this paper

Exact diagonalization results for resonant inelastic x-ray scattering spectra of one-dimensional Mott insulators
We examine the momentum-dependent excitation spectra of indirect as well as direct resonant inelastic x-ray scattering (RIXS) processes in half-filled (extended) Hubbard rings. We determine the
Ultrafast control of spin-orbital separation probed with time-resolved RIXS
Quasi-one-dimensional systems exhibit many-body effects elusive in higher dimensions. A prime example is spin-orbital separation, which has been measured by resonant inelastic X-ray scattering (RIXS)
Probing multi-spinon excitations outside of the two-spinon continuum in the antiferromagnetic spin chain cuprate Sr2CuO3
It is shown that four- spinon excitations can be accessed directly in Sr2CuO3 using resonant inelastic x-ray scattering (RIXS) in a region of phase space clearly separated from the two-spinon continuum, which provides a new route for the creation of magnetic excitations in 1D materials.
Mobile orbitons in Ca2CuO3 : Crucial role of Hund's exchange
We investigate the CuL3 edge resonant inelastic x-ray scattering (RIXS) spectra of a quasi-1D antiferromagnet Ca2CuO3. In addition to the magnetic excitations, which are well-described by the
Spin–orbital separation in the quasi-one-dimensional Mott insulator Sr2CuO3
The separation of the orbital degree of freedom (orbiton) is observed using resonant inelastic X-ray scattering on the one-dimensional Mott insulator Sr2CuO3 to resolve an orbiton separating itself from spinons and propagating through the lattice as a distinct quasi-particle with a substantial dispersion in energy over momentum.
Ab initio computation of d-d excitation energies in low-dimensional Ti and V oxychlorides
Using a quantum chemical cluster-in-solid computational scheme, we calculate the local d-d excitation energies for two strongly correlated Mott insulators, the oxychlorides TiOCl and VOCl. TiOCl
Indirect K-edge bimagnon resonant inelastic x-ray scattering spectrum of α-FeTe.
The predicted RIXS spectrum can be utilized to understand the role of multi-channel bimagnon spin excitations present in the α-FeTe chalcogenide, which is sensitive to next-next nearest neighbor and biquadratic coupling interactions.
Unoccupied electronic structure of TiOCl studied using x-ray absorption near-edge spectroscopy.
It is concluded from FY data that effects of the SP distortion on the electronic structure are absent in the incommensurate intermediate phase within experimental accuracy.


Momentum dependence of orbital excitations in Mott-insulating titanates.
High-resolution resonant inelastic x-ray scattering has been used to determine the momentum dependence of orbital excitations in Mott-insulating LaTiO(3) and YTiO(3) over a wide range of the
Measurement of magnetic excitations in the two-dimensional antiferromagnetic Sr₂CuO₂Cl₂ insulator using resonant x-ray scattering: evidence for extended interactions.
The spectral line shape at (π, 0) indicates sizable quantum effects in SCOC and probably more generally in the cuprates, and an extended t-t'-t''-U one-band Hubbard model is employed, finding significant electronic hopping beyond nearest-neighbor Cu ions, indicative of extended magnetic interactions.
Low energy electronic excitations in the layered cuprates studied by copper L3 resonant inelastic x-ray scattering.
The resonant inelastic x-ray scattering (RIXS) spectra at the Cu L3 edge in a variety of cuprates are measured, demonstrating here a great potential, thanks to the resonance strength and to the large 2p spin-orbit splitting.
Dispersion of magnetic excitations in the cuprate La2CuO4 and CaCuO2 compounds measured using resonant x-ray scattering.
By resonant inelastic x-rays scattering in the soft x-ray regime they probe the dynamical multiple-spin correlations in the antiferromagnetic cuprates La2CuO4 and CaCuO2, finding coherent spin excitations without free parameters.
Collective magnetic excitations in the spin ladder Sr14Cu24O41 measured using high-resolution resonant inelastic x-ray scattering.
The findings demonstrate that RIXS couples to two-triplon collective excitations, and confirm that optical selection rules are obeyed for excitations from this spherically symmetric quantum spin-liquid ground state.
Localized electronic excitations in NiO studied with resonant inelastic X-Ray scattering at the Ni M threshold: evidence of spin flip.
The good energy resolution allows an unambiguous identification of several spectral features due to excitations and the dependence of the RIXS spectra on the excitation energy gives evidence of local spin flip and yields a value of 125 +/- 15 meV for the antiferromagnetic exchange interaction.
Observation of two nondispersive magnetic excitations in NiO by resonant inelastic soft-X-Ray scattering.
High resolution resonant inelastic x-ray scattering data measured at the Ni L3 edge (2p_{3/2}-->3d) on the paradigmatic antiferromagnetic oxide NiO reveal clear signatures of magnetic excitations at approximately 95 and approximately 190 meV whose energy seems independent from transferred momentum.
Theoretical demonstration of how the dispersion of magnetic excitations in cuprate compounds can be determined using resonant inelastic X-ray scattering.
It is shown that in resonant inelastic x-ray scattering (RIXS) at the copper L and M edge direct spin-flip scattering is in principle allowed and how this possibility can be exploited to probe the dispersion of magnetic excitations of cuprates such as the high T(c) superconductors.
Magnetic excitations and phase separation in the underdoped La2-xSrxCuO4 superconductor measured by resonant inelastic X-ray scattering.
It is shown that the single magnon dispersion measured with RIXS coincides with the one determined by inelastic neutron scattering, thus demonstrating that x rays are an alternative to neutrons in this field.
Theory of resonant inelastic x-ray scattering by collective magnetic excitations.
I present a tractable theory for the resonant inelastic x-ray scattering (RIXS) of magnons. The low-energy transition operator is written as a product of local spin operators and fundamental x-ray