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@ARTICLE{Knyazev:454542,
      author       = {Knyazev, Yu. V. and Chumakov, A. I. and Dubrovskiy, A. A.
                      and Semenov, S. V. and Sergeev, Ilya and Yakushkin, S. S.
                      and Kirillov, V. L. and Martyanov, O. N. and Balaev, D. A.},
      title        = {{N}uclear forward scattering application to the spiral
                      magnetic structure study in $ε − ${F}e$_ 2${O}$_3$},
      journal      = {Physical review / B},
      volume       = {101},
      number       = {9},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {PUBDB-2021-00593},
      pages        = {094408},
      year         = {2020},
      abstract     = {The $ε − $Fe$_ 2$O$_3$ magnetic structure has been
                      analyzed using the synchrotron radiation source. Time
                      spectra of nuclear forward scattering for isolated
                      nanoparticles with an average size of 8 nm immobilized in a
                      xerogel matrix have been recorded in the temperature range
                      of 4–300K in applied magnetic fields of 0–4T in the
                      longitudinal direction at the European Synchrotron Radiation
                      Facility (ESRF, Grenoble, France). It has been found that
                      the external magnetic field does not qualitatively change
                      the H$_{hf}$(T) behavior, but makes a strong opposite impact
                      on the hyperfine fields in the nonequivalent iron sites,
                      leading to the divergence of H$_{hf}$ polar angle
                      dependences below 80 K. A complete diagram of the $ε −
                      $Fe$_ 2$O$_3$ magnetic structure in the temperature range of
                      4–300K is proposed. At 300 K, the $ε − $Fe$_ 2$O$_3$
                      compound is confirmed to be a collinear ferrimagnet. The
                      experimental results show that the magnetic transition at
                      150–80K leads to the formation of a noncollinear magnetic
                      structure. Furthermore, in the range of the 80–4 K, the
                      ground state of a magnetic spiral is established. The
                      experimental results are supplemented by the analysis of the
                      exchange interactions and temperature dependence of the
                      magnetization in a magnetic field of 7 T.},
      cin          = {FS-PET-S},
      ddc          = {530},
      cid          = {I:(DE-H253)FS-PET-S-20190712},
      pnm          = {6212 - Quantum Condensed Matter: Magnetism,
                      Superconductivity (POF3-621)},
      pid          = {G:(DE-HGF)POF3-6212},
      experiment   = {EXP:(DE-MLZ)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000518435300001},
      doi          = {10.1103/PhysRevB.101.094408},
      url          = {https://bib-pubdb1.desy.de/record/454542},
}