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@ARTICLE{Schweika:907761,
      author       = {Schweika, W. and Valldor, M. and Reim, J. D. and Rößler,
                      U. K.},
      title        = {{C}hiral {S}pin {L}iquid {G}round {S}tate in {YB}a{C}o 3
                      {F}e{O} 7},
      journal      = {Physical review / X},
      volume       = {12},
      number       = {2},
      issn         = {2160-3308},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2022-02194},
      pages        = {021029},
      year         = {2022},
      abstract     = {A chiral spin liquid state is discovered in the highly
                      frustrated, noncentrosymmetric swedenborgite compound
                      YBaCo3FeO7, a layered kagome system of hexagonal symmetry,
                      by advanced polarized neutron scattering from a single
                      domain crystalline sample. The observed diffuse magnetic
                      neutron scattering has an antisymmetric property that
                      relates to its specific chirality, which consists of three
                      cycloidal waves perpendicular to the c axis, forming an
                      entity of cylindrical symmetry. Chirality and symmetry agree
                      with relevant antisymmetric exchanges arising from broken
                      spatial parity. Applying a Fourier analysis to the chiral
                      interference pattern, with distinction between kagome sites
                      and the connecting trigonal interlayer sites of threefold
                      symmetry, the chiral spin correlation function is
                      determined. Characteristic chiral waves originate from the
                      trigonal sites and extend over several periods in the kagome
                      planes. The chiral spin liquid is remarkably stable at low
                      temperatures despite strong antiferromagnetic spin exchange.
                      The observation raises a challenge, since the commonly
                      accepted ground states in condensed matter either have
                      crystalline long-range order or form a quantum liquid. We
                      show that, within the classical theory of magnetic order, a
                      disordered ground state may arise from chirality. The
                      present scenario, with antisymmetric exchange acting as a
                      frustrating gauge background that stabilizes local spin
                      lumps, is similar to the avoided phase transition in coupled
                      gauge and matter fields for subnuclear particles.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT / JCNS-FRM-II / MLZ},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 / I:(DE-588b)4597118-3},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
      experiment   = {EXP:(DE-MLZ)DNS-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000800143400001},
      doi          = {10.1103/PhysRevX.12.021029},
      url          = {https://juser.fz-juelich.de/record/907761},
}