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@ARTICLE{MacDougall:827997,
      author       = {MacDougall, G. J. and Aczel, A. A. and Su, Yixi and
                      Schweika, W. and Faulhaber, E. and Schneidewind, A. and
                      Christianson, A. D. and Zarestky, J. L. and Zhou, H. D. and
                      Mandrus, D. and Nagler, S. E.},
      title        = {{R}evisiting the ground state of {C}o{A}l 2 {O} 4 :
                      {C}omparison to the conventional antiferromagnet {M}n{A}l 2
                      {O} 4},
      journal      = {Physical review / B},
      volume       = {94},
      number       = {18},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2017-02019},
      pages        = {184422},
      year         = {2016},
      abstract     = {The A-site spinel material CoAl2O4 is a physical
                      realization of the frustrated diamond-lattice
                      antiferromagnet, a model in which unique incommensurate or
                      “spin-spiral-liquid” ground states are predicted. Our
                      previous single-crystal neutron scattering study instead
                      classified it as a “kinetically inhibited”
                      antiferromagnet, where the long-ranged correlations of a
                      collinear Néel ground state are blocked by the freezing of
                      domain-wall motion below a first-order phase transition at
                      T∗=6.5 K. This paper provides new data sets from a number
                      of experiments, which support and expand this work in
                      several important ways. We show that the phenomenology
                      leading to the kinetically inhibited order is unaffected by
                      sample measured and instrument resolution, while new
                      low-temperature measurements reveal spin correlations are
                      unchanging between T=2 K and 250 mK, consistent with a
                      frozen state. Polarized diffuse neutron measurements show
                      several interesting magnetic features, which can be entirely
                      explained by the existence of short-ranged Néel order.
                      Finally, and crucially, this paper presents some neutron
                      scattering studies of single crystalline MnAl2O4, which acts
                      as an unfrustrated analog to CoAl2O4 and shows all the
                      hallmarks of a classical antiferromagnet with a continuous
                      phase transition to Néel order at TN=39 K. Direct
                      comparison between the two compounds indicates that CoAl2O4
                      is unique, not in the nature of high-temperature diffuse
                      correlations, but rather in the nature of the frozen state
                      below T∗. The higher level of cation inversion in the
                      MnAl2O4 sample indicates that this behavior is primarily an
                      effect of greater next-nearest-neighbor exchange.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; 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)DNS-20140101 / EXP:(DE-MLZ)PANDA-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000387887100005},
      doi          = {10.1103/PhysRevB.94.184422},
      url          = {https://juser.fz-juelich.de/record/827997},
}