Zhang Zixun, Shao Jifeng, Jin Feng, Dai Kunjie, Li Jingyuan, Lan Da, Hua Enda, Han Yuyan, Wei Long, Cheng Feng, Ge Binghui, Wang Lingfei, Zhao Yue, Wu Wenbin
Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.
Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
Nano Lett. 2022 Sep 28;22(18):7328-7335. doi: 10.1021/acs.nanolett.2c01352. Epub 2022 Sep 6.
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 = 1/3 of LaCaMnO. 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 DyScO(001) substrate, the AFI ground state is achieved in a wide range of doping levels (0 ≤ ≤ 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.
在此，我们使用各种衬底证明，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 LaCaMnO 的 = 1/3 处诱导出一种新兴的反铁磁绝缘（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 DyScO(001) 衬底施加的大的单轴应变，在很宽的掺杂水平范围（0 ≤ ≤ 1/2）内实现了 AFI 基态，留下了一个扩展的 AFI 相图。此外，发现静水压力可以将 AFI 相调回到一个隐藏的铁磁金属相，同时伴随着适应性应变的形成。适应性应变、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，这一结果可能为具有竞争磁相互作用的其他功能钙钛矿的相空间控制提供启示。
