Emergence of Quasi Two-Dimensional Electronic States at the Interface of LSMO/STO via Lattice Mismatch-Induced Strains
Emergence of Quasi Two-Dimensional Electronic States at the Interface of LSMO/STO via Lattice Mismatch-Induced Strains
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DOI：
10.1021/acsaelm.2c00967
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发表时间：
2022-08
影响因子：
4.7
通讯作者：
S. Pati;T. Usami;S. Komori;T. Taniyama
中科院分区：
文献类型：
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作者：
S. Pati;T. Usami;S. Komori;T. Taniyama
二维界面电子相经常出现在不同氧化物层之间的界面处，其可以显示出与其体相显著不同的性质。然而，这种附加相在界面处的演化机制及其性质尚未完全了解。在这里，我们检测到一个额外的结构和磁性相和所谓的准二维电子状态的La0.7Sr0.3MnO3（LSMO）与SrTiO 3（STO）的接口，而LSMO与[Pb（Mg 1/3 Nb 2/3）O3]0.7-[PbTiO 3]0.3（PMN-PT）基板界面显示出单相。我们发现，附加相具有较低的居里温度，较大的有效饱和磁化强度，和较大的吉尔伯特阻尼系数比其体对应。我们讨论了晶格失配引起的应变在附加态的形成中所起的重要作用。这些结果将为设计全氧化物电子学，包括2D自旋电子学提供深入的见解。
A two-dimensional interfacial electronic phase often emerges at the interface between different oxide layers, which may display remarkably distinct properties from its bulk phases. The mechanism of evolution of such an additional phase at the interface and its properties, however, are not fully understood yet. Herein, we detect an additional structural and magnetic phase and so-called quasi two-dimensional electronic states of La0.7Sr0.3MnO3(LSMO) that interface with SrTiO3(STO), while LSMO interfaced with a [Pb(Mg1/3Nb2/3)O3]0.7-[PbTiO3]0.3(PMN-PT) substrate shows a single phase. We find that the additional phase exhibits a lower Curie temperature, a larger effective saturation magnetization, and a larger Gilbert damping coefficient than its bulk counterpart. We discuss that the lattice mismatch-induced strain plays an important role in the formation of the additional state. These results will give an insight into designing full-oxide electronics, including 2D spintronics.