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@ARTICLE{Nair:172356,
      author       = {Nair, Harikrishnan and Fu, Zhendong and Voigt, Jörg and
                      Su, Yixi and Brückel, Thomas},
      title        = {{A}pproaching the true ground state of frustrated {A}-site
                      spinels: {A} combined magnetization and polarized neutron
                      scattering study},
      journal      = {Physical review / B},
      volume       = {89},
      number       = {17},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2014-05836},
      pages        = {174431},
      year         = {2014},
      abstract     = {We re-investigate the magnetically frustrated,
                      diamond-lattice-antiferromagnet spinels FeAl2O4 and MnAl2O4
                      using magnetization measurements and diffuse scattering of
                      polarized neutrons. In FeAl2O4, macroscopic measurements
                      evidence a “cusp” in zero field-cooled susceptibility
                      around 13 K. Dynamic magnetic susceptibility and memory
                      effect experiments provide results that do not conform with
                      a canonical spin-glass scenario in this material. Through
                      polarized neutron-scattering studies, absence of long-range
                      magnetic order down to 4 K is confirmed in FeAl2O4. By
                      modeling the powder averaged differential magnetic
                      neutron-scattering cross section, we estimate that the
                      spin-spin correlations in this compound extend up to the
                      third nearest-neighbor shell. The estimated value of the
                      Landé g factor points towards orbital contributions from
                      Fe2+. This is also supported by a Curie-Weiss analysis of
                      the magnetic susceptibility. MnAl2O4, on the contrary,
                      undergoes a magnetic phase transition into a long-range
                      ordered state below ≈40 K, which is confirmed by
                      macroscopic measurements and polarized neutron diffraction.
                      However, the polarized neutron studies reveal the existence
                      of prominent spin fluctuations co-existing with long-range
                      antiferromagnetic order. The magnetic diffuse intensity
                      suggests a similar short-range order as in FeAl2O4. Results
                      of the present work support the importance of spin-spin
                      correlations in understanding magnetic response of
                      frustrated magnets like A-site spinels which have
                      predominant short-range spin correlations reminiscent of the
                      “spin-liquid” state.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT / JCNS (München) ; Jülich
                      Centre for Neutron Science JCNS (München) ; JCNS-FRM-II},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-FRM-II-20110218},
      pnm          = {422 - Spin-based and quantum information (POF2-422) / 424 -
                      Exploratory materials and phenomena (POF2-424) / 542 -
                      Neutrons (POF2-542) / 544 - In-house Research with PNI
                      (POF2-544) / 54G - JCNS (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-422 / G:(DE-HGF)POF2-424 /
                      G:(DE-HGF)POF2-542 / G:(DE-HGF)POF2-544 /
                      G:(DE-HGF)POF2-54G24},
      experiment   = {EXP:(DE-MLZ)DNS-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000336752500005},
      doi          = {10.1103/PhysRevB.89.174431},
      url          = {https://juser.fz-juelich.de/record/172356},
}