Volume 118, Number 5, June 2017
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||01 August 2017|
Charge driven metal-insulator transitions in LaMnO3|SrTiO3 (111) superlattices
1 King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division (PSE) Thuwal 23955-6900, Saudi Arabia
2 Integrated Materials Design Centre (IMDC), School of Chemical Engineering, UNSW Australia Sydney, NSW 2052, Australia
3 Asia Pacific Center for Theoretical Physics - Pohang, Gyeongbuk 790-784, Korea
Received: 6 June 2017
Accepted: 10 July 2017
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 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.
PACS: 73.20.At – Surface states, band structure, electron density of states / 73.22.-f – Electronic structure of nanoscale materials and related systems / 75.70.Cn – Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
© EPLA, 2017
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