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@INPROCEEDINGS{Shahed:892598,
      author       = {Shahed, Hend},
      title        = {{E}lucidation of {C}aloric {E}ffect in {S}pin {C}rossover
                      {C}ompound},
      reportid     = {FZJ-2021-02188},
      year         = {2021},
      abstract     = {Improving refrigeration technology receives great
                      scientific attention, leading to new efficient materials and
                      refrigeration mechanism to replace the standard vapor
                      compression technology. The caloric refrigeration cycle is
                      an alternative technology. It is based on the temperature
                      change of the material when exposed to an external magnetic,
                      electric field, or hydrostatic pressure. Recently, spin
                      crossover compounds have been recognized as a promising
                      candidate to exhibit large caloric effects. Large
                      barocaloric effects has been reported for some of these SCO
                      compounds at fairly low hydrostatic pressures (<1.2GPa) [1].
                      SCO complexes in which the central metal ion switches
                      between two different spin states from a low spin (LS) state
                      to a high spin (HS) state by varying pressure, temperature,
                      or irradiation of light. In the SCO compounds the entropy
                      changes (and consequently the caloric effect) originate not
                      only from the magnetic subsystem (accounting for only about
                      $30\%$ of the entropy change) [2]. The major part of the
                      entropy change originates from changes in the intramolecular
                      vibrations [2,3].In this work, we are studying two SCO
                      complexes consisting of Fe (II) as a central ion bounded to
                      six nitrogen atoms. The first compound is Fe (PM-Bia)2(NCS)2
                      PM-Bia = (N-(2'- pyridylmethylene)-4-amino-bi-phenyl) which
                      crystallizes in two polymorphs depending on the synthesis
                      route. Polymorph (P1) has an orthorhombic space group
                      (Pccn). It undergoes a thermal abrupt spin transition around
                      170 K. Polymorph (P2) crystallizes in the monoclinic space
                      group (P21/c) and undergoes a gradual spin transition around
                      200 K [4]. The second compound is Fe(PM–AzA)2(NCS)2 PM-aza
                      = (N-(2'-pyridylmethylene)-4-(azophenyl) aniline which
                      crystallizes in the monoclinic space group (P21/c) and
                      undergoes a gradual spin transition around Tsco ~ 189 K
                      [5].In this talk, we will present the temperature-dependent
                      magnetization and the powder x-ray diffraction results of
                      these two compounds. Also, I will discuss the results from
                      ESRF temperature-dependent single crystal data.References[1]
                      K. G. Sandeman, APL Mater., vol. 4, no. 11, pp. 4–9,
                      2016.[2] S. P. Vallone et al., Adv. Mater., vol. 31, no. 23,
                      pp. 1–7, 2019.[3] P.J. von Ranke, J. Magn. and Magn.
                      Mater., 489, 165421, 2019.[4] J. F. Létard et al.,
                      Monatshefte fur Chemie, vol. 134, no. 2, pp. 165–182,
                      2003.[5] S. Lakhloufi et al., Phys. Chem. Chem. Phys., vol.
                      18, no. 40, pp. 28307–28315, 2016.},
      organization  = {Digital Institute Seminar JCNS-2,
                       (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/892598},
}