This title appears in the Scientific Report :
2019
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevLett.122.137201 in citations.
Please use the identifier: http://hdl.handle.net/2128/22127 in citations.
Rearrangement of Uncorrelated Valence Bonds Evidenced by Low-Energy Spin Excitations in YbMgGaO 4
Rearrangement of Uncorrelated Valence Bonds Evidenced by Low-Energy Spin Excitations in YbMgGaO 4
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 o...
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Personal Name(s): | Li, Yuesheng (Corresponding author) |
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Bachus, Sebastian / Liu, Benqiong / Radelytskyi, Igor / Bertin, Alexandre / Schneidewind, Astrid / Tokiwa, Yoshifumi / Tsirlin, Alexander A. / Gegenwart, Philipp | |
Contributing Institute: |
Heinz Maier-Leibnitz Zentrum; MLZ Streumethoden; JCNS-2 JCNS-FRM-II; JCNS-FRM-II |
Published in: | Physical review letters, 122 (2019) 13, S. 137201 |
Imprint: |
College Park, Md.
APS
2019
|
DOI: |
10.1103/PhysRevLett.122.137201 |
PubMed ID: |
31012603 |
Document Type: |
Journal Article |
Research Program: |
Jülich Centre for Neutron Research (JCNS) FRM II / MLZ |
Subject (ZB): | |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/22127 in citations.
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. |