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AuthorZayed, M.E.
AuthorRuegg, C.
AuthorStrassle, T.
AuthorStuhr, U.
AuthorRoessli, B.
AuthorAy, M.
AuthorMesot, J.
AuthorLink, P.
AuthorPomjakushina, E.
AuthorStingaciu, M.
AuthorConder, K.
AuthorRonnow, H.M.
Available date2016-02-22T09:04:54Z
Publication Date2014-08
Publication NamePhysical Review Letters
CitationZayed, M.E., R�egg, C., Str?ssle, T., Stuhr, U., Roessli, B., Ay, M., Mesot, J., Link, P., Pomjakushina, E., Stingaciu, M., Conder, K., R?nnow, H.M. "Correlated decay of triplet excitations in the shastry-sutherland compound SrCu2 (BO3)2", (2014) Physical Review Letters, 113 (6), art. no. 067201
AbstractThe temperature dependence of the gapped triplet excitations (triplons) in the 2D Shastry-Sutherland quantum magnet SrCu2(BO3)2 is studied by means of inelastic neutron scattering. The excitation amplitude rapidly decreases as a function of temperature, while the integrated spectral weight can be explained by an isolated dimer model up to 10 K. Analyzing this anomalous spectral line shape in terms of damped harmonic oscillators shows that the observed damping is due to a two-component process: one component remains sharp and resolution limited while the second broadens. We explain the underlying mechanism through a simple yet quantitatively accurate model of correlated decay of triplons: an excited triplon is long lived if no thermally populated triplons are nearby but decays quickly if there are. The phenomenon is a direct consequence of frustration induced triplon localization in the Shastry-Sutherland lattice.
SponsorSwiss National Science Foundation.
PublisherAmerican Physical Society
SubjectAtomic physics
SubjectAccurate modeling
SubjectDamped harmonic oscillator
SubjectExcitation amplitudes
SubjectQuantum magnets
SubjectSpectral line shape
SubjectSpectral weight
SubjectTemperature dependence
SubjectTriplet excitation
TitleCorrelated decay of triplet excitations in the shastry-sutherland compound SrCu2 (BO3)2
Issue Number6
Volume Number113

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