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@ARTICLE{Mishra:20184,
      author       = {Mishra, S.K. and Mittal, R. and Chaplot, S. L. and
                      Ovsyannikov, S.V. and Trots, D.M. and Dubrovinsky, L. and
                      Su, Y. and Brückel, T. and Matsuishi, S. and Hosono, H. and
                      Garbarino, G.},
      title        = {{P}ressure dependence of the low-temperature crystal
                      structure and phase transition behavior of {C}a{F}e{A}s{F}
                      and {S}r{F}e{A}s{F}: {A} synchrotron x-ray diffraction
                      study},
      journal      = {Physical review / B},
      volume       = {84},
      number       = {22},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-20184},
      pages        = {224513},
      year         = {2011},
      note         = {R. Mittal and S. K. Mishra thank the Department of Science
                      and Technology (DST), India for providing financial support
                      to carry out synchrotron x-ray diffraction at the European
                      Synchrotron Radiation Facility, Grenoble, France.},
      abstract     = {We report systematic investigation of high pressure crystal
                      structures and structural phase transition up to 46 GPa in
                      CaFeAsF and 40 GPa in SrFeAsF at 40 K using powder
                      synchrotron x-ray diffraction experiments and Rietveld
                      analysis of the diffraction data. We find that CaFeAsF
                      undergoes orthorhombic to monoclinic phase transition at P-c
                      = 13.7 GPa while increasing pressure. SrFeAsF exhibits
                      coexistence of orthorhombic and monoclinic phases over a
                      large pressure range from 9 to 39 GPa. The coexistence of
                      the two phases indicates that the transition is of first
                      order in nature. Unlike in the 122 compounds (BaFe2As2 and
                      CaFe2As2), we do not find any collapse tetragonal
                      transition. The transition to a lower symmetry phase
                      (orthorhombic to monoclinic) in 1111 compounds under
                      pressure is in contrast with the transition to a high
                      symmetry phase (orthorhombic to tetragonal) in 122-type
                      compounds. On heating from 40 K at high pressure, CaFeAsF
                      undergoes monoclinic to tetragonal phase transition around
                      25 GPa and 200 K. Further, it does not show any
                      post-tetragonal phase transition and remains in the
                      tetragonal phase up to 25 GPa at 300 K. The dP(c)/dT is
                      found to be positive for the CaFeAsF and CaFe2As2, however
                      the same was not found in case of BaFe2As2.},
      keywords     = {J (WoSType)},
      cin          = {PGI-4 / JARA-FIT / JCNS (München) ; Jülich Centre for
                      Neutron Science JCNS (München) ; JCNS-FRM-II / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-4-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {Grundlagen für zukünftige Informationstechnologien /
                      Großgeräte für die Forschung mit Photonen, Neutronen und
                      Ionen (PNI)},
      pid          = {G:(DE-Juel1)FUEK412 / G:(DE-Juel1)FUEK415},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000298555800011},
      doi          = {10.1103/PhysRevB.84.224513},
      url          = {https://juser.fz-juelich.de/record/20184},
}