| Numéro |
J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|---|---|---|
| Page(s) | C8-1495 - C8-1496 | |
| DOI | https://doi.org/10.1051/jphyscol:19888688 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-1495-C8-1496
DOI: 10.1051/jphyscol:19888688
1 Max-Planck-Institut für Festkörperforschung D-7000 Stuttgart 80, F.R.G.
2 Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada, L8S 4M1
3 Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada, B3H 3J5
J. Phys. Colloques 49 (1988) C8-1495-C8-1496
DOI: 10.1051/jphyscol:19888688
SPECIFIC HEAT OF MTa2O6 (M = Co, Ni, Fe, Mg) EVIDENCE FOR LOW DIMENSIONAL MAGNETISM
R. K. Kremer1, J. E. Greedan2, E. Gmelin1, W. Dai1, M. A. White3, S. M. Eicher2 et K. J. Lushington21 Max-Planck-Institut für Festkörperforschung D-7000 Stuttgart 80, F.R.G.
2 Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada, L8S 4M1
3 Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada, B3H 3J5
Abstract
We report the heat capacities of MTa2O6 (M = Co,Ni,Fe,Mg). Antiferromagnetic ordering is observed at 6.67 K (Co), 10.55 K (Ni) and 8.1 K (Fe). Short range correlations above Tc contribute substantially to the heat capacity of the magnetic compounds. The magnetic part in the heat capacity of the Co and Ni compound can be described by a very anisotropic square planar S = 1/2 Ising model. Magnetic ordering in FeTa2O6 takes place in a S = 1 triplet ground state. The short range order contributions are compared to the heat capatities of S = 1 afm chains.