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@INPROCEEDINGS{Heinze:1048338,
      author       = {Heinze, Leonie and Kotte, T. and Rausch, R. and Demuer, A.
                      and Luther, S. and Feyerherm, R. and Ammerlaan, A. A. L. 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        = {{Q}uantum criticality and dimensional reduction in the
                      frustrated sawtooth chain compound atacamite},
      reportid     = {FZJ-2025-04560},
      year         = {2025},
      abstract     = {We present evidence for the presence of a field-induced
                      quantum critical point (QCP) at 21.9(1) T (H || c axis) in
                      the frustrated quantum magnet atacamite Cu$_2$Cl(OH)$_3$, a
                      mineral which we have recently identified as a material
                      realization of sawtooth chains [J ~ 336 K (basal-basal), J'
                      ~ 102 K (basal-apical)]. Residual interchain couplings lead
                      to long-range antiferromagnetic order in atacamite below
                      $T_\mathrm{N}$ = 8.9(1) K. Through extensive high-field
                      studies of the heat capacity, we were able to map the
                      entropy landscape of atacamite up to 35 T. It features
                      highly distorted isentropes indicative of quantum
                      criticality in the material. By further combining
                      macroscopic and microscopic high-field measurement
                      techniques, we provide evidence for the QCP at 21.9(1) T to
                      separate field regions with and without long-range magnetic
                      order, but far away from full polarization of the material.
                      Underpinned by numerical results we propose this behavior to
                      be relatedto an effective dimensional reduction of the
                      material, where the chains decouple into independent
                      subunits. We interpret this behavior as a special type of
                      dimensional reduction caused by the interchain network.},
      month         = {May},
      date          = {2025-05-25},
      organization  = {International Conference on Highly
                       Frustrated Magnetism, Toronto (Canada),
                       25 May 2025 - 30 May 2025},
      subtyp        = {After Call},
      cin          = {JCNS-4 / JCNS-3 / MLZ / JCNS-FRM-II},
      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)6},
      url          = {https://juser.fz-juelich.de/record/1048338},
}