| Numéro |
J. Phys. Colloques
Volume 40, Numéro C2, Mars 1979
International Conference on The Applications of The Mössbauer Effect
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|---|---|---|
| Page(s) | C2-226 - C2-229 | |
| DOI | https://doi.org/10.1051/jphyscol:1979281 | |
J. Phys. Colloques 40 (1979) C2-226-C2-229
DOI: 10.1051/jphyscol:1979281
CHARGE AND RELATED SPIN PERTURBATIONS IN MAGNETIC METALS : AN INTERPRETATION OF MÖSSBAUER SPECTRA OF THE HEUSLER ALLOYS Pd2MnSn1-xSbx
D. C. Price1, J.D. Rush2 and C.E. Johnson21 Dept. of Solid State Physics, Research School of Physical Sciences, Australian National University, Canberra, Australia
2 Dept. of Physics, University of Liverpool, Liverpool, U.K.
Résumé
Bien que la composition semble avoir peu d'influence sur le paramètre du réseau et le moment magnétique dans les alliages ferromagnétiques de Heusler du type Pd2MnSn1-xSbx (0 ≤ x ≤ 1), la spectrométrie Mössbauer met en évidence une assez large augmentation des densités de charge et de spin à la fois sur 119Sn et 121Sb quand x croît de 0 à 1. A partir d'un modèle simple, on tente d'expliquer cet accroissement par l'existence d'oscillations à grandes distances des charges d'écran des ions Sn e t Sb.
Abstract
Despite only very small changes with composition of the lattice parameter and magnetic moment in the ferromagnetic Heusler alloy series Pd2MnSn1-xSbx (0 ≤ x ≤ 1), Mössbauer measurements show quite large increases in the charge and spin densities at both 119Sn and 121Sb nuclei as x goes from 0 to 1. Using a simple model, the possibility is examined that these increases arise from the longrange oscillatory effects of the electrostatic screening of Sn and Sb ions. Changes in both the charge and spin densities of a comparable magnitude to those observed can be obtained, so it is concluded that this mechanism may be important and warrants a more realistic calculation.