Percolative metal-insulator transition in
- Univ. of Missouri, Columbia, MO (United States)
- Carnegie Inst. of Washington, Washington, DC (United States); Argonne National Lab. (ANL), Argonne, IL (United States). HPSynC, Geophysical Laboratory, Carnegie Institution of Washington, Advanced Photon Source
- Univ. of Pavia (Italy)
In this work, we show that the pressure-induced metal-insulator transition (MIT) in LaMnO3 is fundamentally different from the Mott-Hubbard transition and is percolative in nature, with the measured resistivity obeying the percolation scaling laws. Using the Gutzwiller method to treat correlation effects in a model Hamiltonian that includes both Coulomb and Jahn-Teller interactions, we show, one, that the MIT is driven by a competition between electronic correlation and the electron-lattice interaction, an issue that has been long debated, and two, that with compressed volume, the system has a tendency towards phase separation into insulating and metallic regions, consisting, respectively, of Jahn-Teller distorted and undistorted octahedra. This tendency manifests itself in a mixed phase of intermixed insulating and metallic regions in the experiment. Conduction in the mixed phase occurs by percolation and the MIT occurs when the metallic volume fraction, steadily increasing with pressure, exceeds the percolation threshold vc ≈ 0.29. Finally, measured high-pressure resistivity follows the percolation scaling laws quite well, and the temperature dependence follows the Efros-Shklovskii variable-range hopping behavior for granular materials.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0001057; FG02-00ER45818
- OSTI ID:
- 1371238
- Alternate ID(s):
- OSTI ID: 1234770
- Journal Information:
- Physical Review B, Vol. 93, Issue 2; Related Information: EFree partners with Carnegie Institution of Washington (lead); California Institute of Technology; Colorado School of Mines; Cornell University; Lehigh University; Pennsylvania State University; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Origin of colossal magnetoresistance in LaMnO 3 manganite
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journal | August 2015 |
Monitoring LaMnO 3 Jahn–Teller distortion via electric-field gradient ab initio calculations
|
journal | November 2019 |
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