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@INPROCEEDINGS{Qi:1047414,
      author       = {Qi, Ji},
      title        = {{E}lucidating barocaloric effect in spin crossover
                      compounds with inelastic scattering methods},
      reportid     = {FZJ-2025-04283},
      year         = {2025},
      abstract     = {The barocaloric effect (BCE) is characterized as a thermal
                      response (variation of temperature or entropy) in
                      solid-state materials induced by external hydrostatic
                      pressure. Cooling technologies based on the BCE have emerged
                      as a promising alternative to conventional vapor-compression
                      cooling. Recently, spin crossover (SCO) transitions, where
                      the low spin (LS) and high spin (HS) states can be switched
                      by hydrostatic pressure, were proposed as a potential
                      mechanism to generate outstanding BCE. In this work, we aim
                      to unveil the correlation between structure change and
                      dynamic properties of a classic SCO complex
                      Fe(PM-BiA)2(NCS)2 (with PM = N-2’- pyridylmethylene and
                      BiA = 4-aminobiphenyl) for elucidating the impact of
                      cooperativity on the barocaloric
                      performance.Fe(PM-BiA)2(NCS)2 crystallizes in two different
                      structures (orthorhombic (OP) with abrupt transition and
                      monoclinic (MP) with gradual transition). The complete and
                      Fe-related density of states are accessed through inelastic
                      neutron scattering (INS) and nuclear inelastic scattering
                      (NIS), respectively. The single crystal diffraction
                      evidences the potential dynamic disorder of phenyl groups. A
                      two-site reorientation mode of the phenyl group at the
                      picosecond time scale has been realized by quasi elastic
                      neutron scattering (QENS). Furthermore, through a
                      combination of complementary inelastic scattering
                      techniques, we quantitatively unveiled the microscopic
                      origin of the giant entropy change, providing direct
                      experimental insight into its underlying mechanism. Our
                      study deepens the understanding of caloric effects in SCO
                      complexes and promotes their potential application as BCE
                      refrigerants.},
      organization  = {(Digital) Institute Seminar JCNS-2,
                       Forschungszentrum Jülich, JCNS
                       (Germany)},
      subtyp        = {Invited},
      cin          = {JCNS-2 / JARA-FIT},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$},
      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/1047414},
}