title: Two-spinon and orbital excitations of the spin-Peierls system TiOCl.
abstract: 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 observe a dispersive two-spinon excitation and estimate the inter- and intradimer magnetic exchange coupling from a comparison to cluster calculations.
authors: Experimentelle Physik 4, Universität Würzburg, 97074 Würzburg, Germany.
authors: S
authors: S
authors: Glawion
authors: J
authors: J
authors: Heidler
authors: M W
authors: MW
authors: Haverkort
authors: L C
authors: LC
authors: Duda
authors: T
authors: T
authors: Schmitt
authors: V N
authors: VN
authors: Strocov
authors: C
authors: C
authors: Monney
authors: K J
authors: KJ
authors: Zhou
authors: A
authors: A
authors: Ruff
authors: M
authors: M
authors: Sing
authors: R
authors: R
authors: Claessen