Istituto dei materiali per l'elettronica ed il magnetismo     
Magnani N., Paoluzi A., Pareti L., Stride J. A. Inelastic neutron scattering study of Pr2Co12Fe5. In: Journal of Physics-Condensed Matter, vol. 20 (10) article n. 104222. IOP Publishing LTD, 2008.
Inelastic neutron scattering measurements have been performed on the intermetallic compounds Pr2Co12Fe5 (and Y2Co12Fe5) on the IN4 time-of-flight spectrometer at the Institut Laue-Langevin, Grenoble. The data on the yttrium-based compound have been used to estimate the phonon scattering. A broad peak is detected at 18 meV, whose deduced Q dependence (when only the magnetic contribution is considered) is consistent with the form factor of Pr3+ ions; in the high-Q region, the same peak displays a clear phononic character. The experimental results are analysed by a molecular field model including exchange and crystal-field contributions, and the derived value for the exchange parameter is consistent with the trend inferred by studying Pr2Co17 and Pr2Fe17. A possible mechanism for the generation of the large volume magnetostriction, to be checked by further experiments, is suggested.
URL: http://iopscience.iop.org/0953-8984/20/10/104222/?ejredirect=.iopsciencetrial
DOI: 10.1088/0953-8984/20/10/104222
Subject 78.70.Nx Neutron inelastic scattering
3.20.kk Phonon interactions with other quasiparticles
75.30.Et Exchange and superexchange interactions

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