Singlet-Triplet Excitations in the Unconventional Spin-Peierls System TiOBr
J.P. Clancy, B.D. Gaulin, C.P. Adams, G.E. Granroth, A.I. Kolesnikov,, T.E. Sherline, and F.C. Chou
TL;DR
This study uses neutron scattering to measure magnetic excitations in TiOBr, revealing two triplet excitation branches and the first direct measurement of its singlet-triplet energy gap of about 21.2 meV.
Contribution
First direct measurement of the singlet-triplet energy gap in TiOBr using neutron scattering techniques.
Findings
Two magnetic excitation branches observed in TiOBr.
Singlet-triplet energy gap determined to be 21.2 meV.
Identification of triplet excitations in different spin-Peierls phases.
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 SNS. 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 measurements represent the first direct measure of the singlet-triplet energy gap in TiOBr, which is determined to be Eg = 21.2 +/- 1.0 meV.
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Taxonomy
TopicsHigh-pressure geophysics and materials · Atomic and Subatomic Physics Research · Nuclear Physics and Applications