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@INPROCEEDINGS{Eich:878352,
      author       = {Eich, Andreas},
      title        = {{T}he {C}rystal {S}tructure {B}ehaviour of {C}r{A}s at
                      {L}ow {T}emperatures and at {H}igh {P}ressures},
      reportid     = {FZJ-2020-02799},
      year         = {2020},
      abstract     = {Chromium Arsenide (CrAs) is the first reported Cr-based
                      superconductor, exhibiting pressure-induced
                      superconductivity above ~0.3 GPa with a maximum Tc ≈ 2.2 K
                      at 1 GPa. The superconducting phase region with a dome-like
                      shape lies in the vicinity of a helimagnetically ordered
                      antiferromagnetic state, with a region of coexistence of
                      magnetism and superconductivity below ~0.7 GPa. Short-range
                      magnetic fluctuations are assumed to play an essential role
                      for the pairing mechanism of the superconductivity, and CrAs
                      is considered to be a model system for the interplay of
                      superconductivity and helimagnetism.Up to now, most studies
                      on CrAs in and near the superconducting phase region were
                      focused on magnetic and resistive properties. The crystal
                      structure of CrAs, however, has not been conclusively
                      investigated yet, especially in dependence on the
                      temperature, with only a few isolated data points existing
                      for the full structure. The aim of our investigation is thus
                      to give an overview of the complete structural behaviour of
                      CrAs in dependence of temperature and pressure to serve as
                      reference for later studies in the two-parameter field.Our
                      results based on synchrotron X-ray single-crystal
                      diffraction reveal previously unknown features of CrAs
                      related to the first-order phase transition from the
                      paramagnetic to the antiferromagnetic state at TN ≈ 267 K.
                      A significant change in the microstructure might have
                      practical implications for the occurrence of the
                      superconductivity, while the discovery of one distinguished
                      interatomic distance in the structure might further
                      elucidate the nature of the superconductivity on a
                      fundamental level.},
      month         = {Aug},
      date          = {2020-08-06},
      organization  = {Institutsseminar des JCNS-2,
                       Forschungszentrum Jülich (Germany), 6
                       Aug 2020},
      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          = {144 - Controlling Collective States (POF3-144) / 524 -
                      Controlling Collective States (POF3-524) / 6212 - Quantum
                      Condensed Matter: Magnetism, Superconductivity (POF3-621) /
                      6213 - Materials and Processes for Energy and Transport
                      Technologies (POF3-621) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-524 /
                      G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6213 /
                      G:(DE-HGF)POF3-6G4},
      typ          = {PUB:(DE-HGF)31},
      url          = {https://juser.fz-juelich.de/record/878352},
}