Spin glass behaviour in the Co2−xZnxTiO4 compound
- 68 Downloads
A.c. susceptibility measurements were carried out on the disordered spinel system Co2−xZnxTiO4 (0<x<1) between 10 and 80 K. Our measurements show three peaks in the Χ versus T curve for Co2TiO4 and CoZnTiO4 compounds. In both compounds two peaks are very close to each other, indicating that the Néel and semi-spin glass temperatures are very close. A third peak indicates the presence of the semi-spin glass to spin glass transition. In Co1.5Zn0.5TiO4 only one peak is observed which indicates spin glass ordering at 26 K. Furthermore, the A-site canting present in Co2TiO4 and CoZnTiO4 has a collinear and magnetic structure, indicating strong A-B coupling. X-ray analysis indicated that compounds of the system Co2ZnxTiO4 synthesized with cubic symmetry. From transport properties it was found that the activation energy and thermoelectric coefficient decrease with increasing concentration of Zn in the system. The mobility of the system calculated from infrared measurements is typically of the order of 10−9cm2V−1s−1.
KeywordsPolymer Activation Energy Glass Transition Transport Property Magnetic Structure
Unable to display preview. Download preview PDF.
- 8.J. Villain, Z. Phys. B33 (1979) 31.Google Scholar