Orbital order and electronic correlations in a planar model for manganites
Understanding orbital ordered (OO) Mott insulating states lies at the heart of a consistent resolution of thecolossal magneto-resistance (CMR) observed in manganites, where its melting induces a low-T insulator-metal transition upon hole doping for 0.25 ≤ x ≤ 0.45. Motivated thereby, we study the OO...
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| Main Authors: | , , , |
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| Format: | Online |
| Language: | Portuguese |
| Published: |
Universidade Estadual de Campinas
2015
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| Subjects: | |
| Online Access: | https://econtents.sbu.unicamp.br/inpec/index.php/physicae/article/view/13315 |
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| Summary: | Understanding orbital ordered (OO) Mott insulating states lies at the heart of a consistent resolution of thecolossal magneto-resistance (CMR) observed in manganites, where its melting induces a low-T insulator-metal transition upon hole doping for 0.25 ≤ x ≤ 0.45. Motivated thereby, we study the OO states in a planar model for bilayer manganites using dynamical-mean-field-theory (DMFT) and finite-size diagonalisation methods. We derive the OO ground states in manganites, for x = 0, 2 1 , 3 2 , 34 in agreement with observations, including the charge-orbital-magnetic ordered stripe phases for x > 12 . These OO states are shown to be associated with an alloy ordering of the d 3x 2 −r 2 /d 3y 2 −r 2 orbitals on each Mn 3+ site. |
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| ISSN: | 1679-9569 |
