METALLICLIKE MICTOMAGNETIC STATE IN LA0.55R0.15CA0.3MNO3 (R = Y AND HO)

The magnetic and electronic transport properties of the title compound s are systematically studied. Both compounds are found to have similar properties. The magnetic measurements are consistent with the mictoma gnetic behavior. An insulator-to-metal transition is observed with dec reasing temperature and the low temperature resistivity shows the meta lliclike feature. It is proposed that apart from the already identifie d ferromagnetic metal and spin glass insulator. phases, the metallicli ke mictomagnetic phase should exist at the boundary area between the t wo known phases in the universal phase diagram for the manganates. (C) 1998 American Institute of Physics.