Ferroelectric charge order enhanced by magnetic frustration in dimer Mott insulators

We investigate the effect of magnetic frustration on the dielectric properties of dimer Mott insulators. We adopt the two-dimensional quarter-filled extended Hubbard model for [kappa]-(BEDT-TTF)2X with an additional coupling with the dimer lattice motions, and numerically obtain the ground state. In...

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Veröffentlicht in:	Physical review. B 2016-01, Vol.93 (3), Article 035105
Hauptverfasser:	Gomi, Hiroki, Inagaki, Takeshi J., Takahashi, Akira
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Sprache:	eng
Schlagworte:	Alternations Charge Coupling Dimers Ferroelectricity Frustration Insulators Mathematical models
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creator	Gomi, Hiroki Inagaki, Takeshi J. Takahashi, Akira
description	We investigate the effect of magnetic frustration on the dielectric properties of dimer Mott insulators. We adopt the two-dimensional quarter-filled extended Hubbard model for [kappa]-(BEDT-TTF)2X with an additional coupling with the dimer lattice motions, and numerically obtain the ground state. In the parameter range for strong magnetic frustration, an interdimer bond-length alternation mode that lifts the quasidegeneracy of classical spin configurations is strongly coupled to the electron system; this alternation mode occurs even with an extremely small electron-lattice coupling constant. Furthermore, the bond-length alternation induces in the dimers electric dipoles, which align along the same direction. A dimer Mott insulator phase with the ferroelectric charge order is obtained in the region. These results are consistent with the relaxorlike dielectric anomaly in [kappa]-(BEDT-TTF)2Cu2(CN)3.
doi_str_mv	10.1103/PhysRevB.93.035105
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We adopt the two-dimensional quarter-filled extended Hubbard model for [kappa]-(BEDT-TTF)2X with an additional coupling with the dimer lattice motions, and numerically obtain the ground state. In the parameter range for strong magnetic frustration, an interdimer bond-length alternation mode that lifts the quasidegeneracy of classical spin configurations is strongly coupled to the electron system; this alternation mode occurs even with an extremely small electron-lattice coupling constant. Furthermore, the bond-length alternation induces in the dimers electric dipoles, which align along the same direction. A dimer Mott insulator phase with the ferroelectric charge order is obtained in the region. These results are consistent with the relaxorlike dielectric anomaly in [kappa]-(BEDT-TTF)2Cu2(CN)3.</description><identifier>ISSN: 2469-9950</identifier><identifier>EISSN: 2469-9969</identifier><identifier>DOI: 10.1103/PhysRevB.93.035105</identifier><language>eng</language><subject>Alternations ; Charge ; Coupling ; Dimers ; Ferroelectricity ; Frustration ; Insulators ; Mathematical models</subject><ispartof>Physical review. 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In the parameter range for strong magnetic frustration, an interdimer bond-length alternation mode that lifts the quasidegeneracy of classical spin configurations is strongly coupled to the electron system; this alternation mode occurs even with an extremely small electron-lattice coupling constant. Furthermore, the bond-length alternation induces in the dimers electric dipoles, which align along the same direction. A dimer Mott insulator phase with the ferroelectric charge order is obtained in the region. These results are consistent with the relaxorlike dielectric anomaly in [kappa]-(BEDT-TTF)2Cu2(CN)3.</abstract><doi>10.1103/PhysRevB.93.035105</doi></addata></record>
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title	Ferroelectric charge order enhanced by magnetic frustration in dimer Mott insulators
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