Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101505
Title: Localised magnetism in 2D electrides
Authors: Badrtdinov, D. I.
Nikolaev, S. A.
Issue Date: 2020
Publisher: Royal Society of Chemistry
Citation: Badrtdinov D. I. Localised magnetism in 2D electrides / D. I. Badrtdinov, S. A. Nikolaev. — DOI 10.1039/d0tc01223h // Journal of Materials Chemistry C. — 2020. — Vol. 8. — Iss. 23. — P. 7858-7865.
Abstract: Electride materials offer diverse functionalities owing to their high electron mobility and low work function. Of particular importance are magnetic electrides where the anionic electrons confined in interstitial regions can exhibit both itinerant and localised magnetism and whose experimental realisation and theoretical understanding are still in their infancy. By considering two monolayer electrides LaBr2 and La2Br5, we show that a Mott insulating state can be realised in electrides with localised magnetic moments formed by anionic electrons. Having demonstrated that conventional first-principles approaches are incapable of treating such non-atomic magnetic orbitals, we construct effective electronic models in the basis of Wannier functions associated with the anionic states to unveil the microscopic mechanism underlying magnetism in these systems. Being confined at zero-dimensional cavities, the anionic electrons will be shown to reveal an exotic duality of strong localisation like in d- A nd f-electron systems and large spatial extension inherent to delocalised atomic orbitals. While the former tends to stabilise a Mott-insulating state with localised magnetic moments, the latter results in direct exchange between neighbouring anionic electrons, which dominates over kinetic superexchange. On the basis of spin models, we argue that any long-range magnetic order is prohibited in LaBr2 by Mermin-Wagner theorem, and intersite anisotropy in La2Br5 stabilises weakly coupled ferromagnetic chains. Our study showcases that electride materials combining peculiar features of both localised and delocalised atomic states constitute a unique class of strongly correlated materials. © The Royal Society of Chemistry.
Keywords: ATOMS
BROMINE COMPOUNDS
ELECTRON EMISSION
ELECTRONS
MAGNETIC MOMENTS
QUANTUM CHEMISTRY
FERROMAGNETIC CHAINS
FIRST-PRINCIPLES APPROACHES
HIGH ELECTRON MOBILITY
LONG RANGE MAGNETIC ORDER
MERMIN-WAGNER THEOREM
MICROSCOPIC MECHANISMS
MOTT-INSULATING STATE
STRONGLY CORRELATED MATERIALS
LANTHANUM COMPOUNDS
URI: http://hdl.handle.net/10995/101505
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85086899431
PURE ID: 13141450
ee40f7da-0c45-4f7c-a7d2-0e17d67c2f53
ISSN: 20507534
DOI: 10.1039/d0tc01223h
metadata.dc.description.sponsorship: The authors would like to thank Dr Lee A. Burton for numerous stimulating discussions. D. I. B. acknowledges the Russian Federation Presidential scholarship for providing travel support to visit the Radboud University.
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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