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@ARTICLE{Pradheesh:130576,
      author       = {Pradheesh, R. and Nair, Harikrishna and Kumar, Naveen and
                      Lamsal, Jagat and Nirmala, R. and Santhosh, P. N. and Yelon,
                      W. B. and Malik, S. K. and Sankaranarayanan, V. and
                      Sethupathi, K.},
      title        = {{O}bservation of spin glass state in weakly ferromagnetic
                      {S}r2{F}e{C}o{O}6 double perovskite},
      journal      = {Journal of applied physics},
      volume       = {111},
      number       = {5},
      issn         = {0021-8979},
      address      = {Melville, NY},
      publisher    = {American Institute of Physics},
      reportid     = {FZJ-2013-00944},
      pages        = {-},
      year         = {2012},
      note         = {The authors acknowledge the Department of Science and
                      Technology (DST), India for financial support for providing
                      the facilities used in this study (Grant Nos.
                      SR/FST/PSII-002/2007 and SR/NM/NAT-02/2005). P. R wishes to
                      thank M. Angst and K. Balamurugan for fruitful discussions.},
      abstract     = {A spin glass state is observed in the double perovskite
                      oxide Sr2FeCoO6 prepared through sol-gel technique. Initial
                      structural studies using x rays reveal that the compound
                      crystallizes in tetragonal I4/m structure with lattice
                      parameters, a = 5.4609(2) angstrom and c = 7.7113(7)
                      angstrom. The temperature dependent powder x ray diffraction
                      data reveal no structural phase transition in the
                      temperature range 10-300 K. However, the unit cell volume
                      shows an anomaly coinciding with the magnetic transition
                      temperature thereby suggesting a close connection between
                      lattice and magnetism. Neutron diffraction studies and
                      subsequent bond valence sums analysis show that in
                      Sr2FeCoO6, the B site is randomly occupied by Fe and Co in
                      the mixed valence states of Fe3+ /Fe4+ and Co3+/Co4+. The
                      random occupancy and mixed valence sets the stage for
                      inhomogeneous magnetic exchange interactions and in turn,
                      for the spin glass state in this double perovskite, which is
                      observed as an irreversibility in temperature dependent dc
                      magnetization at T-f similar to 75 K. Dynamical scaling
                      analysis of chi'(T) yields a critical temperature T-ct =
                      75.14(8) K and an exponent zv = 6.2(2) typical for spin
                      glasses. The signature of presence of mixed magnetic
                      interactions is obtained from the thermal hysteresis in
                      magnetization of Sr2FeCoO6. Combining the neutron and
                      magnetization results of Sr2FeCoO6, we deduce that Fe is in
                      low spin state while Co is in both low spin and intermediate
                      spin states. (C) 2012 American Institute of Physics.
                      [doi:10.1063/1.3686137]},
      cin          = {PGI-4 / JCNS-2 / JCNS (München) ; Jülich Centre for
                      Neutron Science JCNS (München) ; JCNS-FRM-II},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-4-20110106 / I:(DE-Juel1)JCNS-2-20110106 /
                      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)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000301729200073},
      doi          = {10.1063/1.3686137},
      url          = {https://juser.fz-juelich.de/record/130576},
}