The interface between the polar LaAlO3 and nonpolar SrTiO3 layers has been shown to exhibit various electronic and magnetic phases such as two dimensional electron gas, superconductivity, magnetism and electronic phase separation. These rich phases are expected due to the strong interplay between charge, spin and orbital degree of freedom at the interface between these complex oxides, leading to the electronic reconstruction in this system. However, until now all of these new properties have been studied extensively based on the interfaces which involve a polar LaAlO3 layer. To investigate the role of the A and B cationic sites of the ABO3 polar layer, here we study various combinations of polar/nonpolar oxide (NdAlO3/SrTiO3, PrAlO3/SrTiO3 and NdGaO3/SrTiO3) interfaces which are similar in nature to LaAlO3/SrTiO3 interface. Our results show that all of these new interfaces can also produce 2DEG at their interfaces, supporting the idea that the electronic reconstruction is the driving mechanism for the creation of the 2DEG at these oxide interfaces. Furthermore, the electrical properties of these interfaces are shown to be strongly governed by the interface strain and strong correlation effects provided by the polar layers. Our observations may provide a novel approach to further tune the properties of the 2DEG at the selected polar/nonpolar oxide interfaces.
@article{arxiv.1208.0410,
title = {Strong electronic correlation and strain effects at the interfaces between polar and nonpolar complex oxides},
author = {A. Annadi and A. Putra and Z. Q. Liu and X. Wang and K. Gopinadhan and Z. Huang and S. Dhar and T. Venkatesan and Ariando},
journal= {arXiv preprint arXiv:1208.0410},
year = {2012}
}