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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},
}