Percolative metal-insulator transition in LaMnO3

Sherafati, M.; Baldini, M.; Malavasi, L.; Satpathy, S.

doi:10.1103/PhysRevB.93.024107

Title: Percolative metal-insulator transition in ${LaMnO}_{3}$

Journal Article · Wed Jan 13 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.024107· OSTI ID:1371238

Sherafati, M. ^[1]; Baldini, M. ^[2]; Malavasi, L. ^[3]; Satpathy, S. ^[1]

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 v_c ≈ 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.

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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

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Cited by: 10 works

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Origin of colossal magnetoresistance in LaMnO ₃ manganite Baldini, Maria; Muramatsu, Takaki; Sherafati, Mohammad Proceedings of the National Academy of Sciences, Vol. 112, Issue 35 https://doi.org/10.1073/pnas.1424866112	journal	August 2015
Monitoring LaMnO ₃ Jahn–Teller distortion via electric-field gradient ab initio calculations Lopes, A. M. L.; Teixeira, R. C.; Moreira, R. P. Electronic Structure, Vol. 1, Issue 4 https://doi.org/10.1088/2516-1075/ab4ed6	journal	November 2019

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Title: Percolative metal-insulator transition in LaMnO 3

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Title: Percolative metal-insulator transition in ${LaMnO}_{3}$