% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@INPROCEEDINGS{Eich:907108,
      author       = {Eich, Andreas},
      title        = {{C}r{A}s at {L}ow {T}emperatures and {H}igh {P}ressures,
                      and the {D}evelopment of {C}lamp {C}ells for {N}eutron
                      {S}cattering {E}xperiments at the {MLZ}},
      reportid     = {FZJ-2022-01839},
      year         = {2022},
      abstract     = {Chromium Arsenide (CrAs) is the first reported Cr-based
                      superconductor, exhibiting superconductivity above ~0.3 GPa
                      with a maximum Tc ≈ 2.2 K at 1 GPa [1]. The
                      superconducting phase region with a dome-like shape lies in
                      the vicinity of a helically ordered antiferromagnetic state,
                      with a region of coexistence of magnetism and
                      superconductivity below ~0.7 GPa [2]. 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 [3].Up to now, most
                      studies on CrAs were focused on magnetic and transport
                      properties. The crystal structure of CrAs, however, has not
                      been conclusively investigated yet, especially in dependence
                      on the temperature. One aim of our investigation is thus to
                      give an overview of the complete structural behavior of CrAs
                      in dependence on temperature and on pressure. 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: The isosymmetrical
                      transition can induce a change in the microstructure, and
                      one distinguished Cr–Cr distance exhibits anomalous
                      behavior [4].In addition, we investigated the magnetic
                      structure of CrAs at low temperature and high pressure by
                      means of neutron single-crystal diffraction. The results
                      show that the commonly accepted helical model is in fact not
                      suited to describe the structure, although an unambiguous
                      determination of the actually correct magnetic structure is
                      not possible on the basis of our data.For a direct
                      investigation of the crystal and magnetic structure of CrAs
                      in and near the superconducting phase region, neutron
                      scattering is the method of choice. To experimentally access
                      the low temperature/high pressure region, we have developed
                      two types of clamp cell suitable for use at the instruments
                      DNS, POLI and MIRA at the Heinz Maier-Leibnitz Zentrum (MLZ)
                      [5]. For each type, two variants were produced (CuBe and
                      NiCrAl “Russian Alloy”), working up to 1.1 GPa and 1.5
                      GPa, respectively. First tests were performed to determine
                      the load/pressure calibration curves (both with and without
                      neutron radiation), to estimate its neutron absorption and
                      background, and to measure magnetic reflections and the
                      thermal response. Future tests will help to establish the
                      cells at MLZ as a standard sample environment.},
      organization  = {(Digital) Institute Seminar JCNS-2
                       (PhD Rehearsal Talk), (Germany + online
                       event)},
      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          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
      typ          = {PUB:(DE-HGF)31},
      url          = {https://juser.fz-juelich.de/record/907108},
}