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@ARTICLE{Li:862498,
author = {Li, Yuesheng and Bachus, Sebastian and Liu, Benqiong and
Radelytskyi, Igor and Bertin, Alexandre and Schneidewind,
Astrid and Tokiwa, Yoshifumi and Tsirlin, Alexander A. and
Gegenwart, Philipp},
title = {{R}earrangement of {U}ncorrelated {V}alence {B}onds
{E}videnced by {L}ow-{E}nergy {S}pin {E}xcitations in
{Y}b{M}g{G}a{O} 4},
journal = {Physical review letters},
volume = {122},
number = {13},
issn = {1079-7114},
address = {College Park, Md.},
publisher = {APS},
reportid = {FZJ-2019-02804},
pages = {137201},
year = {2019},
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.},
cin = {JCNS-FRM-II / JCNS-2 / MLZ},
ddc = {530},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-2-20110106 / I:(DE-588b)4597118-3},
pnm = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
Neutron Research (JCNS) (POF3-623)},
pid = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
experiment = {EXP:(DE-MLZ)PANDA-20140101},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:31012603},
UT = {WOS:000463901800015},
doi = {10.1103/PhysRevLett.122.137201},
url = {https://juser.fz-juelich.de/record/862498},
}