Singlet-triplet excitations in the unconventional spin-Peierls TiOBr compound |
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| Authors: | Clancy J P Gaulin B D Adams C P Granroth G E Kolesnikov A I Sherline T E Chou F C |
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| Institution: | Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada. |
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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. |
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