| Numéro |
J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|---|---|---|
| Page(s) | C8-1237 - C8-1238 | |
| DOI | https://doi.org/10.1051/jphyscol:19888561 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-1237-C8-1238
DOI: 10.1051/jphyscol:19888561
1 Centro de Fisica da Univ. do Porto, INIC, 4000 Porto, Portugal
2 Laboratoire L. Néel, CNRS, 166X 38042 Grenoble Cedex, France
J. Phys. Colloques 49 (1988) C8-1237-C8-1238
DOI: 10.1051/jphyscol:19888561
MAGNETORESISTANCE OF AMORPHOUS ISING SPIN GLASSES : a - (DyxGd1-x) Ni. COEXISTENCE OF MAGNETISM AND WEAK LOCALIZATION
V. S. Amaral1, J. M. Moreira1, J. B. Sousa1, B. Barbara2, J. Filippi2 et B. Dieny21 Centro de Fisica da Univ. do Porto, INIC, 4000 Porto, Portugal
2 Laboratoire L. Néel, CNRS, 166X 38042 Grenoble Cedex, France
Abstract
Magnetoresistivity measurements Ɗρ/ρ have been performed on the random anisotropy system a - (DyxGd1-x)Ni in applied fields 0 < Ha ≤ 10 kOe, 4 < T < 300 K, in samples with x = 1, 0.75, 0.5 and 0.1. At low temperatures Ɗρ/ρ is negative and decreases linearly with √Ha, indicating weak-electron localization effects. Magnetic fluctuations near the freezing temperature are analysed and discussed.