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| Hauptseite > Publikationsdatenbank > Rearrangement of Uncorrelated Valence Bonds Evidenced by Low-Energy Spin Excitations in YbMgGaO 4 |
| Hauptseite > Publikationsdatenbank > Rearrangement of Uncorrelated Valence Bonds Evidenced by Low-Energy Spin Excitations in YbMgGaO 4 |
| Journal Article | FZJ-2019-02804 |
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2019
APS
College Park, Md.
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Please use a persistent id in citations: http://hdl.handle.net/2128/22127 doi:10.1103/PhysRevLett.122.137201
Abstract: dc-magnetization data measured down to 40 mK speak against conventional freezing and reinstateYbMgGaO4as a triangular spin-liquid candidate. Magnetic susceptibility measured parallel andperpendicular to thecaxis reaches constant values below 0.1 and 0.2 K, respectively, thus indicatingthe presence of gapless low-energy spin excitations. We elucidate their nature in the triple-axis inelasticneutron scattering experiment that pinpoints the low-energy (E≤J0∼0.2meV) part of the excitationcontinuum present at low temperatures (T<J0=kB), butcompletelydisappearing upon warming thesystem aboveT≫J0=kB. In contrast to the high-energy part atE>J0that is rooted in the breaking ofnearest-neighbor valence bonds and persists to temperatures well aboveJ0=kB, the low-energy oneoriginates from the rearrangement of the valence bonds and thus from the propagation of unpaired spins.We further extend this picture to herbertsmithite, the spin-liquid candidate on the kagome lattice, and arguethat such a hierarchy of magnetic excitations may be a universal feature of quantum spin liquids.
Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)
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