Enhanced magnetoresistance in the complex perovskite LaCu3Mn4O12
Abstract
Moderate-pressure techniques (P=2 GPa) have been used to prepare the complex LaCu3Mn4O12 perovskite. It has been characterized by neutron powder diffraction, magnetic, and magnetotransport measurements. This material is ferrimagnetic below TC=361 K. The magnetoresistance (MR) is enhanced with respect to that of CaCu3Mn4O12 due to the effective electronic injection that dramatically reduces the bulk resistivity, thus promoting the grain-boundary contribution to the electrical resistance. Values of low-field MR close to 3% at room temperature are achieved for magnetic fields of 1 T.
- Publication:
-
Applied Physics Letters
- Pub Date:
- September 2003
- DOI:
- 10.1063/1.1611647
- Bibcode:
- 2003ApPhL..83.2623A
- Keywords:
-
- 75.47.Lx;
- 75.47.Gk;
- 75.50.Gg;
- Manganites;
- Colossal magnetoresistance;
- Ferrimagnetics