Two-Spinon and Orbital Excitations of the Spin-Peierls System TiOCl

Details Two-Spinon and Orbital Excitations of the Spin-Peierls System TiOCl Two-Spinon and Orbital Excitations of the Spin-Peierls System TiOCl

2011-07-28

arxiv.org/abs/1107.5800v2

Phys. Rev. Lett. 107, 107402 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.107.107402

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 intra-dimer magnetic exchange coupling from a comparison to cluster calculations.

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