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@ARTICLE{Chatterji:858953,
      author       = {Chatterji, T. and Frick, B. and Zamponi, M. and Appel, M.
                      and Nair, H. S. and Pradheesh, R. and Hariprya, G. R. and
                      Sankaranarayanan, V. and Sethupathi, K.},
      title        = {{H}yperfine interaction and electronic spin fluctuation
                      study on ${S}r_(2$ − $x){L}a_x{F}e{C}o{O}_6$ ( x = 0, 1,
                      2) by high-resolution backscattering neutron spectroscopy},
      journal      = {Physical review / B},
      volume       = {98},
      number       = {9},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2018-07779},
      pages        = {094429},
      year         = {2018},
      abstract     = {The study of hyperfine interaction by high-resolution
                      inelastic neutron scattering is not very well known compared
                      to the other competing techniques viz. nuclear magnetic
                      resonance, Mössbauer, perturbed angular correlation
                      spectroscopy, etc. Also, studies have been limited mostly to
                      magnetically ordered systems. Here, we report such a study
                      on Sr2−xLaxFeCoO6 (x=0,1,2) of which the first (Sr2FeCoO6
                      with x=0) has a canonical spin-glass state, the second
                      (SrLaFeCoO6 with x=1) has a so-called magnetic glass state,
                      and the third (La2FeCoO6 with x=2) has a magnetically
                      ordered ground state. Our present study revealed a clear
                      inelastic signal for SrLaFeCoO6, a possible inelastic signal
                      for Sr2FeCoO6 below the spin freezing temperatures Tsf, but
                      no inelastic signal at all for the magnetically ordered
                      La2FeCoO6 in the neutron-scattering spectra. The broadened
                      inelastic signals observed suggest hyperfine field
                      distributions in the two disordered magnetic glassy systems,
                      whereas the absent inelastic signal for the third compound
                      suggests no, or a very small, hyperfine field at the Co
                      nucleus due to Co electronic moment. The hyperfine splitting
                      on the Co nucleus is induced by the electronic spin state of
                      the magnetic sample atom, and our experiments add
                      information concerning the timescale of electronic spin
                      fluctuations by the appearance of quasielastic broadening in
                      the μeV range at low Q and spin freezing on the nanosecond
                      timescale below Tsf. Whereas these features are observed at
                      low Q for x=0 and 1, they are absent for La2FeCoO6, which
                      evidences a gradual increase of the elastic intensity only
                      at large Q near an emerging Bragg peak. Thus both electronic
                      magnetic spin freezing and inelastic excitations arising
                      from nuclear hyperfine splitting at the Co site consistently
                      indicate a different behavior for x=2.},
      cin          = {JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)SPHERES-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000445968300003},
      doi          = {10.1103/PhysRevB.98.094429},
      url          = {https://juser.fz-juelich.de/record/858953},
}