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@ARTICLE{Li:860942,
      author       = {Li, Kunkun and Jin, Shifeng and Guo, Jiangang and Xu,
                      Yanping and Su, Yixi and Feng, Erxi and Liu, Yu and Zhou,
                      Shengqiang and Ying, Tianping and Li, Shiyan and Wang,
                      Ziqiang and Chen, Gang and Chen, Xiaolong},
      title        = {{D}ouble-peak specific heat and spin freezing in the spin-2
                      triangular lattice antiferromagnet {F}e{A}l2{S}e4},
      journal      = {Physical review / B},
      volume       = {99},
      number       = {5},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2019-01585},
      pages        = {054421},
      year         = {2019},
      abstract     = {We report the properties of a triangular lattice
                      iron-chalcogenide antiferromagnet FeAl2Se4.The spin
                      susceptibility reveals a significant antiferromagnetic
                      interaction with a Curie-Weiss temperature ΘCW≃−200K
                      and a spin-2 local moment. Despite a large spin and a large
                      ∣∣ΘCW∣∣, the low-temperature behaviors are
                      incompatible with conventional classical magnets. No
                      long-range order is detected down to 0.4 K. Similar to the
                      well-known spin-1 magnet NiGa2S4, the specific heat of
                      FeAl2Se4 exhibits a double-peak structure and a T2 power law
                      at low temperatures, which are attributed to the underlying
                      quadrupolar spin correlations and the Halperin-Saslow modes,
                      respectively. The spin freezing occurs at ∼14K, below
                      which the relaxation dynamics is probed by the ac
                      susceptibility. Our results are consistent with the early
                      theory for the spin-1 system with Heisenberg and biquadratic
                      spin interactions. We argue that the early proposal of the
                      quadrupolar correlation and gauge glass dynamics may be well
                      extended to FeAl2Se4. Our results provide useful insights
                      about the magnetic properties of frustrated quantum magnets
                      with high spins.},
      cin          = {JCNS-FRM-II / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      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)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000459221500010},
      doi          = {10.1103/PhysRevB.99.054421},
      url          = {https://juser.fz-juelich.de/record/860942},
}