Transport Properties And Local Structure Of Manganites Under High-Pressure
Abstract
It is known that the transport and magnetic properties of colossal magnetoresistive materials (CMR) are affected both by pressure and by magnetic fields. Under pressure, the magnetoresistivity (MR) is suppressed and the metal-insulator and magnetic transition temperatures are shifted. It is believed that these changes are the result of the changes of the symmetry and/or local structure of the crystal. The ideas have not been explored from a structural perspective. To date no transport measurements have been performed above 2 Gpa. With a diamond anvil cell, the transport propeties and local structure of manganite systems were studied up to 8 Gpa. From result of resistivity measurements on La0.60Y0.07Ca0.33MnO3, we found that under pressure the metallic-insulating transition temperatures increase with pressure and saturates near to 2Gpa, and then decrease with pressure. The Tc vs. pressure curve is not linear but parabolic when the pressure range up to 8 GPa is examined. The properties of Bi0.125Ca0.875MnO3, Pr0.7Ca0.3MnO3 and Pr0.5Ca0.5MnO3 under pressure are also studied.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2002
- Bibcode:
- 2002APS..MARJ16003C