arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1901.04776cond-mat.mtrl-sci
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具有可调基态的稀释氧化物界面

Diluted Oxide Interfaces with Tunable Ground States

Yulin Gan, Dennis Valbjørn Christensen, Yu Zhang, Hongrui Zhang, Krishnan Dileep, Zhicheng Zhong, Wei Niu, Damon James Carrad, Kion Norrman, Merlin von Soosten,… 展开作者

Yulin Gan, Dennis Valbjørn Christensen, Yu Zhang, Hongrui Zhang, Krishnan Dileep, Zhicheng Zhong, Wei Niu, Damon James Carrad, Kion Norrman, Merlin von Soosten, Thomas sand Jespersen, Baogen Shen, Nicolas Gauquelin, Johan Verbeeck, Jirong Sun, Nini Pryds, Yunzhong Chen

摘要:

两种氧化物绝缘体之间的金属界面,如LaAlO 3/SrTiO 3(LAO/STO),为电子学和自旋电子学提供了新的机会。然而,由于存在多个轨道布居,定制的界面性质,如基态和金属-绝缘体转变仍然具有挑战性。在这里,我们报告了一个不可预见的可调性的相图LAO/STO合金LAO与铁磁性的LaMnO 3绝缘体,而不形成晶格无序,并在同一时间不改变系统的极性。通过增加Mn掺杂量x,LaAl_(1-x)Mn_xO_3/STO界面在x = 0.225处发生Lifshitz转变,临界载流子密度nc= 2.8E13 cm-2,超导转变温度峰值TSC =255 mK。此外,LaAl 1-xMnxO 3在x >=0.25时变成铁磁性。值得注意的是,在x = 0.3时,金属界面仅由dxy电子填充,并且就在它变得绝缘之前,我们可重复地实现了具有超导性和明显的异常霍尔效应的特征的相同器件。这提供了一种独特而有效的方法来定制氧化物界面,用于设计按需电子和自旋电子器件。

英文摘要:

The metallic interface between two oxide insulators, such as LaAlO3/SrTiO3 (LAO/STO), provides new opportunities for electronics and spintronics. However, due to the presence of multiple orbital populations, tailoring the interfacial properties such as the ground state and metal-insulator transitions remains challenging. Here, we report an unforeseen tunability of the phase diagram of LAO/STO by alloying LAO with a ferromagnetic LaMnO3 insulator without forming lattice disorder and at the same time without changing the polarity of the system. By increasing the Mn-doping level, x, of LaAl1-xMnxO3/STO, the interface undergoes a Lifshitz transition at x = 0.225 across a critical carrier density of nc= 2.8E13 cm-2, where a peak TSC =255 mK of superconducting transition temperature is observed. Moreover, the LaAl1-xMnxO3 turns ferromagnetic at x >=0.25. Remarkably, at x = 0.3, where the metallic interface is populated by only dxy electrons and just before it becomes insulating, we achieve reproducibly a same device with both signatures of superconductivity and clear anomalous Hall effect. This provides a unique and effective way to tailor oxide interfaces for designing on-demand electronic and spintronic devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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