Published December 2004
| Version v1
Journal article
Insulator-metal transition and magnetoresistance of oxygen deficient La0.35Ca0.65MnOy
Creators
- 1. Department of Physics, Tsinghua University, Beijing 100084 (China)
- 2. Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742 (United States)
- 3. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012 (India)
Description
The oxygen content of La0.35Ca0.65MnOy was decreased by annealing the samples at high temperatures in vacuum with graphite powder nearby. Insulator-metal (I-M) transition occurred upon dramatic decrease of oxygen content. Correspondingly the samples showed a large magnetoresistance (MR) and MR=C(M/Ms)2 at 4.5K up to relatively large M/Ms. The results were explained in terms of the variation of Mn3+/Mn4+ ratio and oxygen vacancy ordering induced percolation of the ferromagnetic regions. Spin-dependent hopping model can account for the variation of MR with M/Ms and the variation of C with the decrease of oxygen content
Additional details
Identifiers
- DOI
- 10.1016/j.jmmm.2004.06.017;
- PII
- S0304-8853(04)00667-5;
Publishing Information
- Journal Title
- Journal of Magnetism and Magnetic Materials
- Journal Volume
- 284
- Journal Issue
- 3
- Journal Page Range
- p. 35-42
- ISSN
- 0304-8853
- CODEN
- JMMMDC
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 36070430
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ANNEALING; CALCIUM COMPOUNDS; GRAPHITE; LANTHANUM COMPOUNDS; MAGNETORESISTANCE; MANGANESE COMPOUNDS; MANGANESE IONS; OXIDES; OXYGEN; TEMPERATURE RANGE 0000-0013 K; VACANCIES
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; CARBON; CHALCOGENIDES; CHARGED PARTICLES; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ELEMENTS; HEAT TREATMENTS; IONS; MINERALS; NONMETALS; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; POINT DEFECTS; RARE EARTH COMPOUNDS; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS
Optional Information
- Copyright
- Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.