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Origin of colossal magnetoresistance in LaMnO3 manganite
Phase separation is a crucial ingredient of the physics of manganites; however, the role of mixed phases in the development of the colossal magnetoresistance (CMR) phenomenon still needs to be clarified. In this paper, we report the realization of CMR in a single-valent LaMnO3 manganite. We found that the insulator-to-metal transition at 32 GPa is well described using the percolation theory. Pressure induces phase separation, and the CMR takes place at the percolation threshold. A large memory effect is observed together with the CMR, suggesting the presence of magnetic clusters. The phase separation scenario is well reproduced, solving a model Hamiltonian. Finally, our results demonstrate in a clean way that phase separation is at the origin of CMR in LaMnO3.
- Carnegie Inst. of Washington, Argonne, IL (United States). High Pressure Synergetic Consortium. Geophysical Lab.
- Carnegie Inst. of Washington, Washington, DC (United States). Geophysical Lab.
- Spanish National Research Council (CSIC), Madrid (Spain). Madrid Inst. of Materials Science
- Carnegie Inst. of Washington, Washington, DC (United States). Geophysical Lab.; Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
- Univ. of Pavia (Italy). Dept. of Chemistry; Univ. of Pavia Research Unit (Italy). Italian National Consortium for Materials Science and Technology
- Sapienza Univ. of Rome (Italy). Dept. of Physics
- Univ. of Missouri, Columbia, MO (United States). Dept. of Physics and Astronomy
- Publication Date:
- OSTI Identifier:
- Grant/Contract Number:
- SC0001057; FG02-00ER45818; 604391
- Published Article
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Volume: 112; Journal Issue: 35; Journal ID: ISSN 0027-8424
- National Academy of Sciences, Washington, DC (United States)
- Research Org:
- Carnegie Inst. of Washington, Washington, DC (United States); Univ. of Missouri, Columbia, MO (United States); Spanish National Research Council (CSIC), Madrid (Spain)
- Sponsoring Org:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); European Union (EU)
- Contributing Orgs:
- Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Univ. of Pavia (Italy); Sapienza Univ. of Rome (Italy)
- Country of Publication:
- United States
- 36 MATERIALS SCIENCE; colossal magnetoresistance; high pressure; phase separation; strongly correlated materials; transport measurements
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