Emergent electric field control of phase transformation in oxide superlattices
Emergent electric field control of phase transformation in oxide superlattices
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DOI：
10.1038/s41467-020-14631-3
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发表时间：
2020-02-14
影响因子：
16.6
通讯作者：
Suzuki, Yuri
中科院分区：
文献类型：
--
作者：
Yi, Di;Wang, Yujia;Suzuki, Yuri
电场可以改变材料的结构和性质，从而实现从电池到自旋电子学的各种应用。近年来，电解门控技术被认为是实现电场控制相变的有力手段，它可以产生大电场和电压驱动的离子转移。这类过渡金属氧化物提供了许多在电解选通下呈现强响应的潜在候选物。然而，很少有在室温下显示可逆的结构转变。在这里，我们报告了数字合成的过渡金属氧化物的实现，该氧化物在室温下在不同的晶相之间显示出可逆的、电场控制的转变。在超晶格组成的交替一个单晶胞的SrIrO3和La0.2Sr0.8MnO3，我们发现一个可逆的相变与7%的晶格变化和戏剧性的调制的化学，电子，磁性和光学性质，介导的氧和氢离子的可逆转移。引人注目的是，这种相变是不存在的组成氧化物，固溶体和较大的周期超晶格。我们的发现为这类材料提供了电压控制功能。
Electric fields can transform materials with respect to their structure and properties, enabling various applications ranging from batteries to spintronics. Recently electrolytic gating, which can generate large electric fields and voltage-driven ion transfer, has been identified as a powerful means to achieve electric-field-controlled phase transformations. The class of transition metal oxides provide many potential candidates that present a strong response under electrolytic gating. However, very few show a reversible structural transformation at room-temperature. Here, we report the realization of a digitally synthesized transition metal oxide that shows a reversible, electric-field-controlled transformation between distinct crystalline phases at room-temperature. In superlattices comprised of alternating one-unit-cell of SrIrO3 and La0.2Sr0.8MnO3, we find a reversible phase transformation with a 7% lattice change and dramatic modulation in chemical, electronic, magnetic and optical properties, mediated by the reversible transfer of oxygen and hydrogen ions. Strikingly, this phase transformation is absent in the constituent oxides, solid solutions and larger period superlattices. Our findings open up this class of materials for voltage-controlled functionality.