Exchange-Flips and Order-Disorder Transitions in the Two-Dimensional Random Spin System Rb2CoxMg1-xF4
- 1 August 1984
- journal article
- research article
- Published by Physical Society of Japan in Journal of the Physics Society Japan
- Vol. 53 (8) , 2710-2717
- https://doi.org/10.1143/jpsj.53.2710
Abstract
Magnetization measurements of Rb 2 Co x Mg 1- x F 4 ( x =0.91, 0.82, 0.75, 0.70, 0.60, 0.30), which is a two-dimensional random Ising spin system, have been performed by pulsed high magnetic field up to 500 kOe. The abrupt magnetization changes at 190 kOe and 380 kOe, which are independent of concentration, are due to the exchangeflips of spins with 1 and 2 nearest neighbor Co 2+ spins, respectively. Another change, whose field depends on the concentration, is ascribed to the order-disorder transition similar to that observed in three-dimensional Fe x Zn 1- x F 2 . The temperature dependence of this transition field is also measured for x =0.82 and 0.75 up to the Néel temperature and phase diagrams are obtained. The Néel temperatures determined from this experiment are 68 and 60 K, respectively.Keywords
This publication has 15 references indexed in Scilit:
- Random external fieldsJournal of Statistical Physics, 1984
- Phase transitions in diluted magnets: Critical behavior, percolation, and random fieldsJournal of Statistical Physics, 1984
- Random-field-induced destruction of the phase transition of a diluted two-dimensional Ising antiferromagnet:Physical Review B, 1983
- Random-field effects in the diluted two-dimensional Ising antiferromagnetPhysical Review B, 1983
- Random-Field Effects in Two- and Three-Dimensional Ising AntiferromagnetsPhysical Review Letters, 1982
- Random field effects in disordered anisotropic antiferromagnetsJournal of Physics C: Solid State Physics, 1979
- Inelastic Scattering of Neutrons form Random Two-Dimensional Antiferromagnets Rb2CocMg1-cF4Journal of the Physics Society Japan, 1979
- Spin wave excitations in a two-dimensional Ising-like antiferromagnet, Rb2CoF4Journal of Physics C: Solid State Physics, 1978
- Random-Field Instability of the Ordered State of Continuous SymmetryPhysical Review Letters, 1975
- Observation of a Symmetric Logarithmic Singularity in the Specific Heat of K2CoF4Journal of the Physics Society Japan, 1975