Singlet-Triplet Excitations in the Unconventional Spin-Peierls System TiOBr

Details Singlet-Triplet Excitations in the Unconventional Spin-Peierls System TiOBr Singlet-Triplet Excitations in the Unconventional Spin-Peierls System TiOBr

2010-09-21

arxiv.org/abs/1009.4185v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, submitted for publication

Scientific paper

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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