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Title: 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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [2]
  1. Carnegie Inst. of Washington, Argonne, IL (United States). High Pressure Synergetic Consortium. Geophysical Lab.
  2. Carnegie Inst. of Washington, Washington, DC (United States). Geophysical Lab.
  3. Spanish National Research Council (CSIC), Madrid (Spain). Madrid Inst. of Materials Science
  4. Carnegie Inst. of Washington, Washington, DC (United States). Geophysical Lab.; Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  5. Univ. of Pavia (Italy). Dept. of Chemistry; Univ. of Pavia Research Unit (Italy). Italian National Consortium for Materials Science and Technology
  6. Sapienza Univ. of Rome (Italy). Dept. of Physics
  7. Univ. of Missouri, Columbia, MO (United States). Dept. of Physics and Astronomy
Publication Date:
OSTI Identifier:
1235118
Grant/Contract Number:
SC0001057; FG02-00ER45818; 604391
Type:
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
Publisher:
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
Language:
English
Subject:
36 MATERIALS SCIENCE; colossal magnetoresistance; high pressure; phase separation; strongly correlated materials; transport measurements