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@ARTICLE{JagadishKumar:859437,
      author       = {Jagadish Kumar, G. and Banerjee, Alok and Sinha, A. S. K.
                      and Su, Y. and Nemkovski, K. and Rath, Chandana},
      title        = {{C}ation distribution and magnetic properties of
                      {Z}n-substituted {C}o{C}r 2 {O} 4 nanoparticles},
      journal      = {Journal of applied physics},
      volume       = {123},
      number       = {22},
      issn         = {1089-7550},
      address      = {Melville, NY},
      publisher    = {American Inst. of Physics},
      reportid     = {FZJ-2019-00293},
      pages        = {223905 -},
      year         = {2018},
      abstract     = {CoCr2O4 is a normal spinel where Co occupies the
                      tetrahedral (A) site and Cr occupies the octahedral (B)
                      site; it is important to examine the cation distribution and
                      magnetic properties by substituting a non-magnetic ion like
                      Zn. In this context, we have synthesized pure phase
                      ZnxCo1-xCr2O4 (x = 0.05, 0.1) of crystallite size
                      10 nm through conventional co-precipitation technique.
                      Fourier transform of Co, Zn, and Cr K-edge spectra obtained
                      from extended X-ray absorption fine structure demonstrates
                      that while Co and Zn prefer the A site, Cr strongly occupies
                      the B site. The paramagnetic to long range ferrimagnetic
                      transition, TC, decreases from 97 K in CoCr2O4 (bulk) to
                      87.4 K at x = 0.1 with an intermediate TC of 90 K at
                      x = 0.05. The decrease in TC is ascribed to decrease in
                      A-B exchange interaction confirming the preferential
                      occupation of Zn2+ ions towards the A site. The spin-spiral
                      transition, TS, decreases from 27 K in bulk (CoCr2O4) to
                      24 K at x = 0.1 followed by a spin lock-in transition,
                      TL, observed at 10 K which remains unchanged with increase
                      in Zn concentration. The diffuse neutron scattering in both
                      compositions shows the evidence of long range spiral
                      ordering in contrast to the simultaneous formation of long
                      and short range order in single crystals of CoCr2O4. The
                      decrease in maximum magnetization from 9 to 8 emu/g and an
                      increase in coercivity from 3.2 to 5.2 kOe at 2 K with
                      an increasing Zn concentration from 0.05 to 0.1 have been
                      explained by considering the Yafet-Kittel model},
      cin          = {JCNS-FRM-II / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      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:000435445500013},
      doi          = {10.1063/1.5027137},
      url          = {https://juser.fz-juelich.de/record/859437},
}