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@ARTICLE{Li:55241,
      author       = {Li, H. and Su, Y. and Persson, J. and Meuffels, P. and
                      Walter, J. and Skowronek, R. and Brückel, T.},
      title        = {{C}orrelation between structural and magnetic properties of
                      {L}a7/8{S}r1/8{M}n1-gamma{O}3 delta with controlled
                      nonstoichiometry},
      journal      = {Journal of physics / Condensed matter},
      volume       = {19},
      issn         = {0953-8984},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PreJuSER-55241},
      pages        = {016003-1 - 016003-12},
      year         = {2007},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The structural and magnetic properties of air sintered and
                      Ar and O-2 annealed La0.875Sr0.125Mn1-gamma O3+delta
                      polycrystalline samples have been studied systematically.
                      From the simultaneous refinement of room-temperature x-ray
                      and neutron powder diffraction data, we have found that the
                      crystal structure is orthorhombic (Pbnm, Z = 4; O) for the
                      Ar annealed sample and rhombohedral 3c, Z = 2; R) for the
                      air sintered and O2 annealed samples. At the O - R
                      transition, the average Mn-O-Mn bond angle increases from
                      161.08(4)degrees. (Ar) to 163.38(1)degrees (O-2) and
                      163.64(1)degrees(air). Ar and O-2 annealings cause a
                      decrease of the Curie temperature T-c from 240(1) K (air)
                      via 237(1) K (O-2) to 192(1) K (Ar). The T-c is reduced by
                      similar to $20\%$ for the sample with O structure (Ar) as
                      compared with that of the samples with R structure ( air and
                      O2). The decrease of Tc is explained by the decrease of
                      total strength of magnetic interactions, due to the
                      decreased < Mn-O-Mn > bond angle and increased < Mn-O > bond
                      length, and by the decrease of number of nearest magnetic
                      neighbours. The possible reasons for the decrease of the Mn
                      site occupancy after Ar and O-2 annealings and the sources
                      of apparent excess oxygen are discussed. Thus we have shown
                      that the actual distributions of cation vacancies in the A
                      (La and Sr) and B (Mn) sublattices induced by the changes of
                      Mn and oxygen contents through Ar and O2 annealings play an
                      important role in the structural and magnetic properties.
                      Comparing the Ar annealed with the air sintered sample, a
                      decrease as small as similar to $2.2\%$ of the relative
                      oxygen content leads to a remarkably large (similar to
                      $20\%)$ effect on Tc.},
      keywords     = {J (WoSType)},
      cin          = {IFF-4 / IFF-5 / IFF-6 / Jülich Centre for Neutron Science
                      JCNS (JCNS) ; JCNS / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB784 / I:(DE-Juel1)VDB785 /
                      I:(DE-Juel1)VDB786 / I:(DE-Juel1)JCNS-20121112 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {Kondensierte Materie / Großgeräte für die Forschung mit
                      Photonen, Neutronen und Ionen (PNI)},
      pid          = {G:(DE-Juel1)FUEK414 / G:(DE-Juel1)FUEK415},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000243136300004},
      doi          = {10.1088/0953-8984/19/1/016003},
      url          = {https://juser.fz-juelich.de/record/55241},
}