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@ARTICLE{Kumar:863217,
      author       = {Kumar, Durgesh and Nemkovskiy, Kirill and Su, Y. and Rath,
                      Chandana},
      title        = {{E}nhancement of {C}urie- and spin-spiral temperatures with
                      doping {F}e in multiferroic {C}o{C}r2{O}4 nanoparticles},
      journal      = {Journal of magnetism and magnetic materials},
      volume       = {488},
      issn         = {0304-8853},
      address      = {Amsterdam},
      publisher    = {North-Holland Publ. Co.},
      reportid     = {FZJ-2019-03309},
      pages        = {165378 -},
      year         = {2019},
      abstract     = {Multiferroic, CoCr2O4 bulk material undergoes successive
                      magnetic transitions such as paramagnetic to collinear
                      ferrimagnetic state at Curie temperature (TC) and
                      non-collinear spin-spiral ordering temperature TS followed
                      by a lock-in-transition TL. In this paper, the rich sequence
                      of magnetic transitions in CoCr2O4 nanoparticles after
                      doping with iron ions are investigated by varying the
                      concentration from x = 10 to $40\%.$ With increasing
                      iron concentration from 10 to $40\%,$ while TC increases
                      from 102 to 160 K higher than the TC of pure CoCr2O4, TS
                      increases from 26 to 40 K. Later transition is clearly
                      shown by sharp transition in specific heat measurement.
                      While enhancement in TC is attributed to increase in lattice
                      expansion and the exchange interaction between tetrahedral
                      (A) and octahedral (B) sites, spin-spiral ordering is
                      dictated by B-B interaction. Further, we have examined the
                      magnetic transitions through neutron scattering using
                      polarized neutron beam along three orthogonal directions. We
                      observe that the para to ferrimagnetic transition is found
                      to be continuous and the spiral ordering is diffused in
                      nature irrespective of composition.},
      cin          = {JCNS-FRM-II / JCNS-2 / MLZ},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-588b)4597118-3},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6G15 - FRM II / MLZ (POF3-6G15)},
      pid          = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15},
      experiment   = {EXP:(DE-MLZ)DNS-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000471650700008},
      doi          = {10.1016/j.jmmm.2019.165378},
      url          = {https://juser.fz-juelich.de/record/863217},
}