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Article: Electron quasi-itinerancy intertwined with quantum order by disorder in pyrochlore iridate magnetism
Title | Electron quasi-itinerancy intertwined with quantum order by disorder in pyrochlore iridate magnetism |
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Authors | |
Issue Date | 2020 |
Publisher | American Physical Society. The Journal's web site is located at https://journals.aps.org/prresearch/ |
Citation | Physical Review Research, 2020, v. 2 n. 4, p. article no. 043273 How to Cite? |
Abstract | We point out the emergence of magnetism from the interplay of electron quasi-itinerancy and quantum order by disorder in pyrochlore iridates. Like other Mott insulating iridates, the Ir4+ ion in pyrochlore iridates develops an effective J = 1/2 moment from the on-site spin-orbit coupling. We consider the generic symmetry-allowed exchange between these local moments on a pyrochlore lattice and obtain the mean-field phase diagram. Assuming the superexchange is mediated by direct and/or indirect electron hopping via intermediate oxygens, we derive the exchange interactions in the strong-coupling regime from the Hubbard model. This exchange has a degenerate classical ground-state manifold, and quantum fluctuation selects a noncoplanar ground state, known as quantum order by disorder. Extending to the intermediate-coupling regime, the same noncoplanar order is selected from the degenerate manifold by the kinetic energy, which is dubbed 'electron quasi-itinerancy.' We discuss the experimental relevance of our results and electron quasi-itinerancy among other iridates and 4d/5d magnets. |
Description | Hybrid open access |
Persistent Identifier | http://hdl.handle.net/10722/295794 |
ISSN | 2023 Impact Factor: 3.5 2023 SCImago Journal Rankings: 1.689 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Chen, G | - |
dc.contributor.author | Wang, X | - |
dc.date.accessioned | 2021-02-08T08:14:06Z | - |
dc.date.available | 2021-02-08T08:14:06Z | - |
dc.date.issued | 2020 | - |
dc.identifier.citation | Physical Review Research, 2020, v. 2 n. 4, p. article no. 043273 | - |
dc.identifier.issn | 2643-1564 | - |
dc.identifier.uri | http://hdl.handle.net/10722/295794 | - |
dc.description | Hybrid open access | - |
dc.description.abstract | We point out the emergence of magnetism from the interplay of electron quasi-itinerancy and quantum order by disorder in pyrochlore iridates. Like other Mott insulating iridates, the Ir4+ ion in pyrochlore iridates develops an effective J = 1/2 moment from the on-site spin-orbit coupling. We consider the generic symmetry-allowed exchange between these local moments on a pyrochlore lattice and obtain the mean-field phase diagram. Assuming the superexchange is mediated by direct and/or indirect electron hopping via intermediate oxygens, we derive the exchange interactions in the strong-coupling regime from the Hubbard model. This exchange has a degenerate classical ground-state manifold, and quantum fluctuation selects a noncoplanar ground state, known as quantum order by disorder. Extending to the intermediate-coupling regime, the same noncoplanar order is selected from the degenerate manifold by the kinetic energy, which is dubbed 'electron quasi-itinerancy.' We discuss the experimental relevance of our results and electron quasi-itinerancy among other iridates and 4d/5d magnets. | - |
dc.language | eng | - |
dc.publisher | American Physical Society. The Journal's web site is located at https://journals.aps.org/prresearch/ | - |
dc.relation.ispartof | Physical Review Research | - |
dc.rights | Copyright [2020] by The American Physical Society. This article is available online at [http://dx.doi.org/10.1103/PhysRevResearch.2.043273]. | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.title | Electron quasi-itinerancy intertwined with quantum order by disorder in pyrochlore iridate magnetism | - |
dc.type | Article | - |
dc.identifier.email | Chen, G: gangchen@hku.hk | - |
dc.identifier.authority | Chen, G=rp02491 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1103/PhysRevResearch.2.043273 | - |
dc.identifier.scopus | eid_2-s2.0-85115903651 | - |
dc.identifier.hkuros | 321273 | - |
dc.identifier.volume | 2 | - |
dc.identifier.issue | 4 | - |
dc.identifier.spage | article no. 043273 | - |
dc.identifier.epage | article no. 043273 | - |
dc.identifier.isi | WOS:000605414800003 | - |
dc.publisher.place | United States | - |