Charge driven metal-insulator transitions in LaMnO3|SrTiO3 (111) superlattices

被引：6
作者：
Cossu, F. [1 ,3 ]
Tahini, H. A. [1 ,2 ]
Singh, N. [1 ]
Schwingenschlogl, U. [1 ]
机构：
[1] King Abdullah Univ Sci & Technol, Phys Sci & Engn Div PSE, Thuwal 239556900, Saudi Arabia
[2] UNSW Australia, Sch Chem Engn, Integrated Mat Design Ctr, Sydney, NSW 2052, Australia
[3] Asia Pacific Ctr Theoret Phys, Pohang 790784, Gyeongbuk, South Korea
来源：
EPL | 2017年 / 118卷 / 05期
关键词：
DEVICES;
D O I：
10.1209/0295-5075/118/57001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Interfaces of perovskite oxides, due to the strong interplay between the lattice, charge and spin degrees of freedom, can host various phase transitions, which is particularly interesting if these transitions can be tuned by external fields. Recently, ferromagnetism was found together with a seemingly insulating state in superlattices of manganites and titanates. We therefore study the (111) oriented (LaMnO3)(6-x)|(SrTiO3)(6+ x) (x = -0.5, 0, 0.5) superlattices by means of ab initio calculations, predicting a ferromagnetic ground state due to double exchange in all cases. We shed light on the ferromagnetic coupling in the LaMnO3 region and at the interfaces. The insulating states of specific superlattices can be understood on the basis of Jahn-Teller modes and electron/hole doping. Copyright (C) EPLA, 2017
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页数：5
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