Abstract
Elastic neutron scattering and magnetic susceptibility data are reported for temperatures around the Neél-point,T N=7.3 K, and for zero magnetic field. AboveT N, the temperature dependence of the magnetic central peak intensity can adequately be described within the RPA assuming isotropic exchange between nearest and next-nearest neighbours as the only parameters. This two-parameter model is quantitatively confirmed by the susceptibility data. AtT N, magnetic Bragg-intensities arise almost discontinuously (reaching 70% of the saturation within 0.1 K) accompanied by thermal hysteresis. For all temperatures belowT N the sublattice magnetic moment is explained by solutions of meanfield equations, if an effective quadrupole-quadrupole interaction is included. The quadrupolar coupling parameter is fully consistent with a value determined recently from the softening of thec 44-mode. These results show, that earlier suggestions of renormalization group results upon the origin of the first order phase transition in TbP are not needed.
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A project of the Sonderforschungsbereich 65 “Festkörperspektroskopie” Darmstadt-Frankfurt, supported by the Deutsche Forschungsgemeinschaft
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Kötzler, J., Raffius, G., Loidl, A. et al. Singlet-groundstate magnetism in TbP. Z Physik B 35, 125–132 (1979). https://doi.org/10.1007/BF01321238
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DOI: https://doi.org/10.1007/BF01321238