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@ARTICLE{Heinze:1044510,
      author       = {Heinze, Leonie and Kotte, T. and Rausch, R. and Demuer, A.
                      and Luther, S. and Feyerherm, R. and Ammerlaan, E. L. Q. N.
                      and Zeitler, U. and Gorbunov, D. I. and Uhlarz, M. and Rule,
                      K. C. and Wolter, A. U. B. and Kühne, H. and Wosnitza, J.
                      and Karrasch, C. and Süllow, S.},
      title        = {{A}tacamite {C}u$_2${C}l({OH})$_3$ in {H}igh {M}agnetic
                      {F}ields: {Q}uantum {C}riticality and {D}imensional
                      {R}eduction of a {S}awtooth-{C}hain {C}ompound},
      journal      = {Physical review letters},
      volume       = {134},
      number       = {21},
      issn         = {0031-9007},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2025-03247},
      pages        = {216701},
      year         = {2025},
      abstract     = {We report an extensive high-field study of atacamite
                      Cu$_2$⁢Cl⁢(OH)$_3$, a material realization of quantum
                      sawtooth chains with weak interchain couplings, in
                      continuous and pulsed magnetic fields up to 58 T. In
                      particular, we have mapped the entropy landscape for fields
                      as high as 35 T and have identified a field-induced quantum
                      critical point at 21.9(1) T for H || c axis. The quantum
                      critical point separates field regions with and without
                      magnetic order, evidenced by our thermodynamic study and
                      $^1$H nuclear magnetic resonance spectroscopy, but lies far
                      below full saturation of the magnetization. Corroborated by
                      numerical results using density-matrix renormalization group
                      calculations, we find this behavior associated with a
                      dimensional reduction of the spin system: the sawtooth chain
                      effectively decouples into an antiferromagnetic spin-1/2
                      chain (backbone of the sawtooth chain) in the presence of an
                      exchange field produced by the remaining field-polarized
                      spins.},
      cin          = {JCNS-4 / JCNS-3 / MLZ / JCNS-FRM-II},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-4-20201012 / I:(DE-Juel1)JCNS-3-20170926 /
                      I:(DE-588b)4597118-3 / I:(DE-Juel1)JCNS-FRM-II-20110218},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4) / 632 - Materials – Quantum, Complex and
                      Functional Materials (POF4-632)},
      pid          = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {40531025},
      UT           = {WOS:001503644200008},
      doi          = {10.1103/PhysRevLett.134.216701},
      url          = {https://juser.fz-juelich.de/record/1044510},
}