Uniaxial Strain and Hydrostatic Pressure Engineering of the Hidden Magnetism in La1-xCaxMnO3 (0 ≤ x ≤ 1/2) Thin Films.
Uniaxial Strain and Hydrostatic Pressure Engineering of the Hidden Magnetism in La1-xCaxMnO3 (0 ≤ x ≤ 1/2) Thin Films.
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DOI：
10.1021/acs.nanolett.2c01352
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发表时间：
2022-09
期刊：
影响因子：
10.8
通讯作者：
Zixun Zhang;Jifeng Shao;F. Jin;Kunjie Dai;Jingyuan Li;D. Lan;Enda Hua;Yuyan Han;Long Wei-Long-We
中科院分区：
文献类型：
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作者：
Zixun Zhang;Jifeng Shao;F. Jin;Kunjie Dai;Jingyuan Li;D. Lan;Enda Hua;Yuyan Han;Long Wei-Long-We
在这里，使用各种基材，我们证明面内单轴应变工程可以增强 Jahn-Teller 畸变并促进选择性轨道占据，从而在 La1-xCaxMnO3 的 x = 1/3 处诱导出现反铁磁绝缘 (AFI) 相。这种 AFI 相不仅取决于外延应变的大小，还取决于衬底的对称性。利用 DyScO3(001) 衬底产生的大单轴应变，在较宽的掺杂水平 (0 ≤ x ≤ 1/2) 下实现 AFI 基态，从而留下扩展的 AFI 相图。此外，我们发现静水压力可以将 AFI 相调整回隐藏的铁磁金属相，并伴随着调节应变的形成。调节应变、单轴应变和静水压力的共同作用产生了复杂的相竞争和演化，其结果可能为其他具有竞争性磁相互作用的功能钙钛矿的相空间控制提供启示。
Here, using various substrates, we demonstrate that the in-plane uniaxial strain engineering can enhance the Jahn-Teller distortions and promote selective orbital occupancy to induce an emergent antiferromagnetic insulating (AFI) phase at x = 1/3 of La1-xCaxMnO3. Such an AFI phase depends not only on the magnitude of epitaxial strain but also on the symmetry of the substrates. Using the large uniaxial strain imparted by DyScO3(001) substrate, the AFI ground state is achieved in a wide range of doping levels (0 ≤ x ≤ 1/2), leaving an extended AFI phase diagram. Moreover, it is found that hydrostatic pressure can tune the AFI phase back to a hidden ferromagnetic metallic phase, accompanied by the formation of accommodation strain. The coaction of the accommodation strain, uniaxial strain, and hydrostatic pressure produces complex phase competition and evolution, and the result may shed light on phase space control of other functional perovskites with the competing magnetic interactions.