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@ARTICLE{Sandratskii:60766,
      author       = {Sandratskii, L. M. and Singer, R. and Sasioglu, E.},
      title        = {{H}eisenberg {H}amiltonian description of
                      multiple-sublattice itinerant-electron systems: {G}eneral
                      considerations and applications to {N}i{M}n{S}b and
                      {M}n{A}s},
      journal      = {Physical review / B},
      volume       = {76},
      number       = {18},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-60766},
      pages        = {184406},
      year         = {2007},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {We consider magnetic systems where the magnetic sublattices
                      can be unambiguously separated into sublattices of inducing
                      and induced moments. The concrete numerical calculations are
                      performed for half-metallic ferromagnetic Heusler compound
                      NiMnSb and hexagonal phase of MnAs. In both systems, Mn
                      atoms possess a robust atomic moment that is much larger
                      than the induced moments of other atoms. It is shown that
                      the treatment of the induced moments as independent
                      variables of the Heisenberg Hamiltonian leads to artificial
                      features in the spin-wave spectrum. We show that the
                      artificial features of the model do not have a dramatic
                      influence on the estimated value of the Curie temperature.
                      This is demonstrated within both mean-field approximation
                      and random-phase approximation. It is shown that the
                      calculational scheme where the induced moments are assumed
                      to fully adjust their values and directions to the adiabatic
                      magnetic configurations of the inducing moments is free from
                      the artificial feature in the spin-wave spectra. In this
                      scheme, the exchange interaction between the inducing and
                      induced moments appears as renormalization of the exchange
                      interactions between inducing moments. It is shown that the
                      redistribution of the exchange interactions has strong
                      influence on the estimated value of the Curie temperature
                      because of the decreased number of the degrees of freedom in
                      the thermodynamic model. Different schemes of the mapping of
                      the systems on the Heisenberg Hamiltonian are examined. The
                      similarities and differences in the properties of NiMnSb and
                      MnAs are discussed.},
      keywords     = {J (WoSType)},
      cin          = {CNI / IFF-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB381 / I:(DE-Juel1)VDB781},
      pnm          = {Grundlagen für zukünftige Informationstechnologien /
                      Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK412 / G:(DE-Juel1)FUEK414},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000251326700050},
      doi          = {10.1103/PhysRevB.76.184406},
      url          = {https://juser.fz-juelich.de/record/60766},
}