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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.
 
 
Abstract
(English)
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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