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@INPROCEEDINGS{Eich:878792,
      author       = {Eich, Andreas and Su, Y. and Hutanu, V. and Georgii, R. and
                      Beddrich, L. and Caron, L. and Friese, K. and Grzechnik, A.},
      title        = {{T}he design of the new clamp cells for {H}igh {P}ressure
                      neutron scattering and magnetization measurements},
      reportid     = {FZJ-2020-03045},
      year         = {2020},
      abstract     = {The fundamental requirement to study high-pressure effects
                      is the availability of suitable pressure devices. Their
                      design has to be tailored to the experimental demands
                      regarding the intended pressure, the employed
                      instrumentation and the expected scientific results.Our work
                      presents the development of high pressure devices for two
                      experimental methods: neutron scattering on polycristalline
                      and single crystalline samples and macroscopic magnetization
                      measurements.For the high-pressure neutron experiments, one
                      of the most common types of devices is the clamp cell [1].
                      One of the characteristic features of this device is that
                      the pressure is applied and fixed ex-situ, before the cell
                      is transferred into the experimental setup. While the
                      pressure can thus not be changed in-situ, the advantage of
                      this design is the liberty to use the cell independently in
                      various setups.The use of neutron radiation for scattering
                      experiments on the one hand requires comparatively large
                      samples and thus a large sample space within the cell. On
                      the other hand, due to the high penetration depth of neutron
                      radiation a rather massive design of the cells is possible,
                      provided that neutron-transmissive materials are used.Our
                      cell design has been specifically developed for neutron
                      scattering experiments at low temperatures in the
                      closed-cycle cryostats on the instruments DNS (a diffuse
                      scattering neutron time-of-flight spectrometer), MIRA (a
                      cold three axes spectrometer with optional focussing guides
                      and polarization analysis), and POLI (a polarized hot
                      neutron diffractometer) at the Heinz Maier-Leibnitz Zentrum
                      (MLZ) in Garching, Germany. The cell (Fig. 1) has been
                      produced in two variants (one made from CuBe and one made
                      from NiCrAl “Russian Alloy”), working up to about 1.1
                      GPa and 1.5 GPa, respectively. Since both CuBe and NiCrAl
                      have a very low paramagnetic moment, the cells have low
                      magnetic background, allowing also measurements of magnetic
                      properties.First tests of the cell have been performed to
                      calibrate the load/pressure-curve of the CuBe cell (up to
                      1.1 GPa, slightly exceeding the calculated limit of about
                      1.0 GPa), to estimate cell attenuation and background, and
                      to measure magnetic reflections.Ultimately, these cells are
                      intended for high pressure measurements at ultra-low
                      temperatures and in combination with an applied magnetic
                      field.Figure 1. Schematic drawing of the neutron clamp
                      cell.A second high-pressure cell (Fig. 2) has been developed
                      for temperature-dependent magnetization measurements in a
                      commercially available MPMS (Magnetic Properties Measurement
                      System) from Quantum Design as well as for neutron
                      scattering experiments at MLZ. The cell is also built from
                      NiCrAl, allowing measurements up to 1.5 GPa, higher than
                      with similar commercial pressure cells.Figure 2. Schematic
                      drawing of the magnetization clamp cell.Further tests under
                      various conditions (temperature, pressure, magnetic field)
                      are planned for both cells. The results will help both to
                      establish the present cells and to optimise the design of
                      subsequent cells.Acknowledgements: This work was supported
                      by the project 05K19PA2 from the Bundesministerium für
                      Bildung und Forschung (BMBF). The instrument POLI at MLZ is
                      operated by RWTH Aachen University in cooperation with FZ
                      Jülich (Jülich-Aachen Research Alliance JARA).[1] S.
                      Klotz, Techniques in High Pressure Neutron Scattering. CRC
                      Press 2013.},
      month         = {Sep},
      date          = {2020-09-06},
      organization  = {58th European High Pressure Research
                       Group International Conference, Hotel
                       Smy Puerto de la Cruz,Tenerife (Spain),
                       6 Sep 2020 - 11 Sep 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)24},
      url          = {https://juser.fz-juelich.de/record/878792},
}