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@ARTICLE{MacDougall:201668,
      author       = {MacDougall, G. J. and Gout, D. and Zarestky, J. L. and
                      Ehlers, G. and Podlesnyak, A. and McGuire, M. A. and
                      Mandrus, D. and Nagler, S. E.},
      title        = {{K}inetically inhibited order in a diamond-lattice
                      antiferromagnet},
      journal      = {Proceedings of the National Academy of Sciences of the
                      United States of America},
      volume       = {108},
      number       = {38},
      issn         = {1091-6490},
      address      = {Washington, DC},
      publisher    = {National Acad. of Sciences},
      reportid     = {FZJ-2015-03962},
      pages        = {15693 - 15698},
      year         = {2011},
      abstract     = {Frustrated magnetic systems exhibit highly degenerate
                      ground states and strong fluctuations, often leading to new
                      physics. An intriguing example of current interest is the
                      antiferromagnet on a diamond lattice, realized physically in
                      A-site spinel materials. This is a prototypical system in
                      three dimensions where frustration arises from competing
                      interactions rather than purely geometric constraints, and
                      theory suggests the possibility of unusual magnetic order at
                      low temperature. Here, we present a comprehensive
                      single-crystal neutron scattering study of CoAl2O4, a highly
                      frustrated A-site spinel. We observe strong diffuse
                      scattering that peaks at wavevectors associated with Néel
                      ordering. Below the temperature T∗ = 6.5 K, there is a
                      dramatic change in the elastic scattering lineshape
                      accompanied by the emergence of well-defined spin-wave
                      excitations. T∗ had previously been associated with the
                      onset of glassy behavior. Our new results suggest instead
                      that T∗ signifies a first-order phase transition, but with
                      true long-range order inhibited by the kinetic freezing of
                      domain walls. This scenario might be expected to occur
                      widely in frustrated systems containing first-order phase
                      transitions and is a natural explanation for existing
                      reports of anomalous glassy behavior in other materials.},
      cin          = {ICS-1 / Neutronenstreuung ; JCNS-1 / JCNS-SNS},
      ddc          = {000},
      cid          = {I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)JCNS-1-20110106 /
                      I:(DE-Juel1)JCNS-SNS-20110128},
      pnm          = {451 - Soft Matter Composites (POF2-451) / 54G - JCNS
                      (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-451 / G:(DE-HGF)POF2-54G24},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000295030000014},
      pubmed       = {pmid:21896723},
      doi          = {10.1073/pnas.1107861108},
      url          = {https://juser.fz-juelich.de/record/201668},
}