| Issue |
J. Phys. Colloques
Volume 49, Number C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|---|---|---|
| Page(s) | C8-241 - C8-246 | |
| DOI | https://doi.org/10.1051/jphyscol:19888107 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-241-C8-246
DOI: 10.1051/jphyscol:19888107
1 Department of Metal Science and Technology, Kyoto University, Sabyo-ku, Kyoto 606, Japan
2 Laboratoire Louis Néel, CNRS 166X, 38042, Grenoble, France
3 Institute Laue-Langevin, 156X, 38042, Grenoble, France
J. Phys. Colloques 49 (1988) C8-241-C8-246
DOI: 10.1051/jphyscol:19888107
GIANT SPIN FLUCTUATIONS IN YMn2 AND RELATED COMPOUNDS
M. Shiga1, H. Wada1, Y. Nakamura1, J. Deportes2 et K. R. A. Ziebeck3, 11 Department of Metal Science and Technology, Kyoto University, Sabyo-ku, Kyoto 606, Japan
2 Laboratoire Louis Néel, CNRS 166X, 38042, Grenoble, France
3 Institute Laue-Langevin, 156X, 38042, Grenoble, France
Abstract
Analyses of thermal expansion curves and paramagnetic neutron scattering measurements of Y (Mn1-xAlx)2 and Y1-xScxMn2 systems have revealed that (1) the Mn moment in the itinerant electron antiferromagnet YMn2 collapses at TN and, above TN, it again increases by thermal excitations of spin fluctuations, (2) the substitution of Al for Mn makes the system local moment-type spin glasses, (3) the ground state of Y1-xScxMn2 is paramagnetic for x>0.002 and giant spin fluctuations with strong antiferromagnetic correlations are easily excited. The electronic specific heat coefficient γ and the coefficient of T2 term of electrical resistivity A of Y0.97Sc0.03Mn2 are enormously large, indicating heavy fermion characters.