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@ARTICLE{Zhai:885795,
      author       = {Zhai, Yuan‐Qi and Deng, Yi‐Fei and Fu, Zhendong and
                      Feng, Erxi and Su, Yixi and Shiga, Takuya and Oshio, Hiroki
                      and Zheng, Yan‐Zhen},
      title        = {{R}eentrant {S}pin {G}lass and {L}arge {C}oercive {F}ield
                      {O}bserved in a {S}pin {I}nteger {D}imerized {H}oneycomb
                      {L}attice},
      journal      = {Advanced functional materials},
      volume       = {31},
      number       = {1},
      issn         = {1616-3028},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2020-04092},
      pages        = {2004744},
      year         = {2021},
      abstract     = {2D magnetic materials with dimerized honeycomb lattices can
                      be treated as mixed‐spin square lattices, in which a
                      quantum phase transition may occur to realize the
                      Bose–Einstein condensation of magnons under reachable
                      experimental conditions. However, this has never been
                      successfully realized with integer spin centers. Herein, a
                      spin integer (S = 2) dimerized honeycomb lattice in an
                      iron(II)‐azido compound [Fe(4‐etpy)2(N3)2]n (FEN,
                      4‐etpy = 4‐ethylpyridine) is realized. Morphology
                      characterization by transmission electron microscopy,
                      scanning electron microscopy, and atomic force microscopy
                      spectroscopies show that the thinnest place of the sample is
                      ≈13 nm, which is equal to ten layers of the compound. In
                      contrast to the common magnetic properties of long‐range
                      magnetic ordering, Mössbauer and polarized neutron
                      scattering studies reveal that FEN exhibits a reentrant spin
                      glass behavior owing to competing ferro‐ and
                      antiferromagnetic exchange‐coupling interactions within
                      the lattice. Two spin glass phases with disparate canting
                      angles are characterized at 39 and 28 K, respectively. By
                      using Curély's model, two exchange‐coupling constants (J1
                      = +35.8 cm−1 and J2 = −3.7 cm−1) can be simulated.
                      Moreover, a very large coercive field of ≈1.9 Tesla is
                      observed at 2 K, making FEN a “very hard” van der Waals
                      2D magnetic material.},
      cin          = {JCNS-FRM-II / JCNS-2 / MLZ / JCNS-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-588b)4597118-3 /
                      I:(DE-Juel1)JCNS-4-20201012},
      pnm          = {6212 - Quantum Condensed Matter: Magnetism,
                      Superconductivity (POF3-621) / 144 - Controlling Collective
                      States (POF3-144) / 6G15 - FRM II / MLZ (POF3-6G15) / 6G4 -
                      Jülich Centre for Neutron Research (JCNS) (POF3-623) / 632
                      - Materials – Quantum, Complex and Functional Materials
                      (POF4-632)},
      pid          = {G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-144 /
                      G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4 /
                      G:(DE-HGF)POF4-632},
      experiment   = {EXP:(DE-MLZ)DNS-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000572983200001},
      doi          = {10.1002/adfm.202004744},
      url          = {https://juser.fz-juelich.de/record/885795},
}