MAGNETIC STUDY OF THE CA1-XEUXMNO3 (0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1) PEROVSKITES

摘要

The magnetization and crystal structure of Ca1-xEuxMnO3 (0 less than or equal to x less than or equal to 1) perovskites have been studied, It is shown that these compounds present four concentration regions in which different magnetic phases coexist, The antiferromagnetic phase is associated with a regular arrangement of Mn3+ and Mn4+ ions in ratios 1:3 and 1:1, The ferromagnetic phase is attributed to the charge disordered states and is found in 0 less than or equal to x less than or equal to 0.2 and 0.6 < x < 1 concentration ranges, The samples 0.1 < x < 0.2 show metamagnetic behavior which might result from the collapse of the charge ordered state (1:3), The CaMnO2.94 and EuMnO3.02 are weak ferromagnets with T-N=122 and 40K, respectively. (C) 1997 Academic Press. [References: 13]