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Article: Spin-orbit coupling in d2 ordered double perovskites
Title | Spin-orbit coupling in d2 ordered double perovskites |
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Authors | |
Issue Date | 2011 |
Publisher | American Physical Society. The Journal's web site is located at http://journals.aps.org/prb/ |
Citation | Physical Review B (Condensed Matter and Materials Physics), 2011, v. 84 n. 9, article no. 094420 How to Cite? |
Abstract | We construct and analyze a microscopic model for insulating rock-salt ordered double perovskites, with the chemical formula A2BB ′O6, where the magnetic ion B′ has a 4d2 or 5d2 electronic configuration and forms a face-centered cubic lattice. For these B′ ions, the combination of the triply degenerate antisymmetric two-electron orbital states and strong spin-orbit coupling forms local quintuplets with an effective spin moment j=2. Moreover, due to strongly orbital-dependent exchange, the effective spins have substantial biquadratic and bicubic interactions (fourth and sixth order in the spins, respectively). This leads, at the mean-field level, to a rich ground-state phase diagram, which includes seven different phases: a uniform ferromagnetic phase with an ordering wave vector p=0 and uniform magnetization along the [111] direction, four two-sublattice phases with an ordering wave vector p=2π(001), and two four-sublattice antiferromagnetic phases. Among the two-sublattice phases, there is a quadrupolar ordered phase that preserves time-reversal symmetry. By extending the mean-field theory to finite temperatures, we find 10 different magnetization processes with different magnetic thermal transitions. In particular, we find that thermal fluctuations stabilize the two-sublattice quadrupolar ordered phase in a large portion of the phase diagram. Existing and possible future experiments are discussed in light of these theoretical predictions. © 2011 American Physical Society. |
Persistent Identifier | http://hdl.handle.net/10722/266117 |
ISSN | 2014 Impact Factor: 3.736 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Chen, Gang | - |
dc.contributor.author | Balents, Leon | - |
dc.date.accessioned | 2018-12-27T01:58:54Z | - |
dc.date.available | 2018-12-27T01:58:54Z | - |
dc.date.issued | 2011 | - |
dc.identifier.citation | Physical Review B (Condensed Matter and Materials Physics), 2011, v. 84 n. 9, article no. 094420 | - |
dc.identifier.issn | 1098-0121 | - |
dc.identifier.uri | http://hdl.handle.net/10722/266117 | - |
dc.description.abstract | We construct and analyze a microscopic model for insulating rock-salt ordered double perovskites, with the chemical formula A2BB ′O6, where the magnetic ion B′ has a 4d2 or 5d2 electronic configuration and forms a face-centered cubic lattice. For these B′ ions, the combination of the triply degenerate antisymmetric two-electron orbital states and strong spin-orbit coupling forms local quintuplets with an effective spin moment j=2. Moreover, due to strongly orbital-dependent exchange, the effective spins have substantial biquadratic and bicubic interactions (fourth and sixth order in the spins, respectively). This leads, at the mean-field level, to a rich ground-state phase diagram, which includes seven different phases: a uniform ferromagnetic phase with an ordering wave vector p=0 and uniform magnetization along the [111] direction, four two-sublattice phases with an ordering wave vector p=2π(001), and two four-sublattice antiferromagnetic phases. Among the two-sublattice phases, there is a quadrupolar ordered phase that preserves time-reversal symmetry. By extending the mean-field theory to finite temperatures, we find 10 different magnetization processes with different magnetic thermal transitions. In particular, we find that thermal fluctuations stabilize the two-sublattice quadrupolar ordered phase in a large portion of the phase diagram. Existing and possible future experiments are discussed in light of these theoretical predictions. © 2011 American Physical Society. | - |
dc.language | eng | - |
dc.publisher | American Physical Society. The Journal's web site is located at http://journals.aps.org/prb/ | - |
dc.relation.ispartof | Physical Review B (Condensed Matter and Materials Physics) | - |
dc.rights | Copyright 2011 by The American Physical Society. This article is available online at https://doi.org/10.1103/PhysRevB.84.094420 | - |
dc.title | Spin-orbit coupling in d2 ordered double perovskites | - |
dc.type | Article | - |
dc.description.nature | postprint | - |
dc.identifier.doi | 10.1103/PhysRevB.84.094420 | - |
dc.identifier.scopus | eid_2-s2.0-80053544981 | - |
dc.identifier.volume | 84 | - |
dc.identifier.issue | 9 | - |
dc.identifier.spage | article no. 094420 | - |
dc.identifier.epage | article no. 094420 | - |
dc.identifier.eissn | 1550-235X | - |
dc.identifier.isi | WOS:000295006100002 | - |
dc.identifier.issnl | 1098-0121 | - |