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@INPROCEEDINGS{Nandi:890115,
      author       = {Nandi, Shibabrata},
      title        = {{S}tructure, magnetism, and superconductivity in {F}e-based
                      superconductors},
      reportid     = {FZJ-2021-00704},
      year         = {2021},
      abstract     = {In iron-based high-temperature superconductors, magnetic
                      fluctuations and magneto-elastic effects are believed to be
                      important for the superconducting electron pairing
                      mechanism. To gain insight into the interplay between the
                      different ordering phenomena and the underlying couplings we
                      studied the magnetic order and lattice distortion on AFe2As2
                      (A = Ca, Sr, Ba, Eu) single crystals by neutron and x-ray
                      diffraction. High-resolution x-ray diffraction and neutron
                      scattering measurements reveal an unusually strong response
                      of the lattice and ordered magnetic moment to
                      superconductivity in Co-doped BaFe2As2. We propose that the
                      coupling between lattice and superconductivity is indirect
                      and arises due to the magnetoelastic coupling, in the form
                      of emergent nematic order, and the strong competition
                      between the magnetism and superconductivity. In contrast to
                      the coexistence of superconductivity and antiferromagnetism
                      in the Co-doped “122” sample, we show that the
                      superconductivity and ferromagnetism coexist in the P-doped
                      Eu based “122” Fe-pnictides. Coexistence between these
                      two antagonistic phenomena are puzzling but can be explained
                      in terms of the formation of a spontaneous vortex state.},
      month         = {Jan},
      date          = {2021-01-27},
      organization  = {Seminar RWTH Aachen "Umhabilitation",
                       ZOOM online meeting (ZOOM online
                       meeting), 27 Jan 2021 - 27 Jan 2021},
      subtyp        = {Invited},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632)},
      pid          = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF4-632},
      typ          = {PUB:(DE-HGF)31},
      url          = {https://juser.fz-juelich.de/record/890115},
}