Electronic and magnetic properties in strongly correlated heterostructures

被引：5
作者：
Ueda, Suguru [1 ]
Kawakami, Norio [1 ]
Sigrist, Manfred [2 ]
机构：
[1] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan
[2] ETH, CH-8093 Zurich, Switzerland
来源：
PHYSICAL REVIEW B | 2012年 / 85卷 / 23期
基金：
日本学术振兴会;
关键词：
HUBBARD-MODEL; FERROMAGNETISM; INTERFACE; TITANATE; MOBILITY; OXIDES;
D O I：
10.1103/PhysRevB.85.235112
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present a theoretical study of a model heterostructure for a Mott insulator sandwiched between two band insulators, motivated by SrTiO3/LaTiO3. Particular emphasis is given on the interplay between magnetism and inhomogeneous charge distributions. Our mean-field analysis of the generalized Hubbard model displays numerous ordered phases in the ground-state phase diagram. In particular, we find a canted antiferromagnetic state near the interface when antiferromagnetic ordering exists inside the Mott insulator. A checkerboard charge ordering proposed previously is also stabilized for large long-range Coulomb interactions. Regarding its origin, we also point out the importance of interlayer spin-mediated interactions. It is further shown that such a strong spin-charge coupling gives rise to pronounced magnetic/charge-order phase transitions in external magnetic fields: a first-order metamagnetic transition and a reentrant charge-order transition with checkerboard pattern. The mechanisms stabilizing these intriguing phases are explored through a detailed analysis of the physical quantities with special focus on the spin-charge interplay.
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页数：12
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