Singlet-triplet excitations in the unconventional spin-Peierls TiOBr compound

J. P. Clancy; B. D. Gaulin; C. P. Adams; G. E. Granroth; A. I. Kolesnikov; T. E. Sherline; F. C. Chou

doi:10.1103/PhysRevLett.106.117401

Singlet-triplet excitations in the unconventional spin-Peierls TiOBr compound

J. P. Clancy, B. D. Gaulin, C. P. Adams, G. E. Granroth, A. I. Kolesnikov, T. E. Sherline, F. C. Chou

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

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±1.0meV.

Original language	English
Article number	117401
Journal	Physical Review Letters
Volume	106
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevLett.106.117401
State	Published - Mar 18 2011

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title = "Singlet-triplet excitations in the unconventional spin-Peierls TiOBr compound",

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±1.0meV.",

author = "Clancy, {J. P.} and Gaulin, {B. D.} and Adams, {C. P.} and Granroth, {G. E.} and Kolesnikov, {A. I.} and Sherline, {T. E.} and Chou, {F. C.}",

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AU - Clancy, J. P.

AU - Gaulin, B. D.

AU - Adams, C. P.

AU - Granroth, G. E.

AU - Kolesnikov, A. I.

AU - Sherline, T. E.

AU - Chou, F. C.

PY - 2011/3/18

Y1 - 2011/3/18

N2 - 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±1.0meV.

AB - 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±1.0meV.

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VL - 106

JO - Physical Review Letters

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Singlet-triplet excitations in the unconventional spin-Peierls TiOBr compound

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