A strain-induced new phase diagram and unusually high Curie temperature in manganites
A strain-induced new phase diagram and unusually high Curie temperature in manganites
复制标题
锰酸盐中应变诱导的新相图和异常高的居里温度
DOI：
10.1039/c7tc00768j
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发表时间：
2017
影响因子：
6.4
通讯作者：
Shen Jian
中科院分区：
文献类型：
--
作者：
Kou Yunfang;Miao Tian;Wang Hui;Xie Lin;Wang Yanmei;Lin Hanxuan;Wang Shasha;Liu Hao;Bai Yu;Zhu Yinyan;Shao Jian;Cai Peng;Wang Wenbin;Du Haifeng;Pan Xiaoqing;Wu Ruqian;Yin Lifeng;Shen Jian
提高功能材料的临界温度是开发许多激发物理现象的主要挑战，如高温超导、巨磁电阻、强关联系统中的多铁性等。为此，主要采用了化学掺杂、压力、外延应变、电栅、界面电荷转移和表面或边缘的对称性破缺效应等手段。尽管所有这些努力都取得了一些成功，但室温仍然是非常可取但难以清除的障碍。在这项工作中，我们证明了通过调节外延应变和化学掺杂可以将锰氧化物系统的居里温度提高到300K以上，并基于密度泛函理论(DFT)计算和蒙特卡罗(MC)模拟解释了其内在机制。此外，我们还成功地设计了一种基于高T_c锰氧化物的磁性隧道结器件中的室温自旋注入器。
Raising the critical temperature of functional materials is a major challenge for the exploitation of many exciting physical phenomena, such as high-Tc superconductivity, colossal magnetoresistance, and multiferroicity in strongly correlated systems. To this end, chemical doping, pressure, epitaxial strain, electric gating, interfacial charge transfer, and symmetry broken effects at the surface or edge have been used as the major means. While all these efforts have had some success, room temperature remains as the highly desirable yet difficult hurdle to clear. In this work, we demonstrate that the Curie temperature of a manganite system can be raised to over 300 K by tuning the epitaxial strain and chemical doping, and explain the underlying mechanism based on density functional theory (DFT) calculations and Monte Carlo (MC) simulations. Furthermore, we successfully designed a room temperature spin injector in a magnetic tunnel junction device based on the high-Tc manganite.