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@ARTICLE{Biniskos:1039787,
      author       = {Biniskos, Nikolaos and Schmalzl, K. and Persson, J. and
                      Raymond, S.},
      title        = {{P}aramagnetic fluctuations of the magnetocaloric compound
                      {M}n{F}e 4 {S}i 3},
      journal      = {Physical review / B},
      volume       = {111},
      number       = {5},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2025-01797},
      pages        = {054424},
      year         = {2025},
      abstract     = {An inelastic neutron scattering technique is employed to
                      investigate the paramagnetic spin dynamics in a
                      single-crystalline sample of the magnetocaloric compound
                      MnFe4Si3. In the investigated temperature range, 1.033 x TC
                      to 1.5 x TC , where TC is the Curie temperature, the spin
                      fluctuations are well described by the ferromagnetic
                      Heisenberg model predictions. Apart from the Heisenberg
                      exchange, additional pseudodipolar interactions manifest
                      through a finite long-wavelength relaxation rate that
                      vanishes at the transition temperature (TC = 305 K). Based
                      on the characteristic extent of spin fluctuations in
                      wave-vector and energy space, we determine that the nature
                      of magnetism in MnFe4Si3 is localized above room
                      temperature. This contrasts with the most celebrated Mn- and
                      Fe-based magnetocaloric materials that are considered as
                      itinerant magnets. The field dependence of the paramagnetic
                      spectra shows a strong suppression of the quasielastic
                      excitations, while a field-induced spin-wave mode appears at
                      finite-energy transfers for a magnetic field of 2 T. This
                      modification of the spectra suggests a decrease of magnetic
                      entropy with applied magnetic field that finds echo in the
                      magnetocaloric properties of the system.},
      cin          = {JCNS-2 / JARA-FIT / JCNS-ILL / JCNS-FRM-II},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-ILL-20110128 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218},
      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},
      experiment   = {EXP:(DE-Juel1)ILL-IN12-20150421},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001459360600013},
      doi          = {10.1103/PhysRevB.111.054424},
      url          = {https://juser.fz-juelich.de/record/1039787},
}