Singlet-Triplet Excitations in the Unconventional Spin-Peierls TiOBr Compound Academic Article uri icon

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abstract

  • We have performed time-of-flight neutron scattering measurements on powder samples of the unconventional spin-Peierls compound TiOBr using the fine-resolution Fermi chopper spectrometer (SEQUOIA) at the Spallation Neutron Source at Oak Ridge National Laboratory. These measurements reveal two branches of magnetic excitations within the commensurate and incommensurate spin-Peierls phases, which we associate with n=1 and n=2 triplet excitations out of the singlet ground state. These results represent the first direct measurement of the singlet-triplet energy gap in TiOBr, which has a value of E(g)=21.2±1.0  meV.

authors

  • Clancy, JP
  • Gaulin, Bruce D
  • Adams, CP
  • Granroth, GE
  • Kolesnikov, AI
  • Sherline, TE
  • Chou, FC

publication date

  • March 18, 2011