Ionic Order Engineering in Double-Perovskite Cobaltite
Ionic Order Engineering in Double-Perovskite Cobaltite
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双钙钛矿钴矿的离子有序工程
DOI：
10.1021/acs.chemmater.1c01228
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发表时间：
2021
影响因子：
8.6
通讯作者：
Hasegawa Tetsuya
中科院分区：
文献类型：
--
作者：
Katayama Tsukasa;Chikamatsu Akira;Zhang Yujun;Yasui Shintaro;Wadati Hiroki;Hasegawa Tetsuya
双钙钛矿GdBaCo2O5.5（GBCO）表现出各种令人着迷的特征，包括温度和磁场诱导的铁磁到反铁磁的相变，这与两个离子顺序相关：沿c轴的A位Gd/Ba顺序，以及沿b轴的八面体CoO6/锥体CoO5顺序。然而，离子序的精细控制仍然是一个具有挑战性的问题。在此，我们展示了通过适当选择基材来设计 GBCO 薄膜中的离子顺序。具体来说，我们制备了四种薄膜，其中仅包含Gd/Ba序[在SrTiO3(001)上]、仅包含CoO6/CoO5序[在LaSrGaO4(001)上]以及同时包含Gd/Ba和CoO6/CoO5序[在NdGaO3(110)和LaSrAlO4(001)(LSAO)上]。除了通过基材选择实现选择性离子顺序外，LSAO 上的 GBCO 薄膜还包含多个域，其域边界为 [CoOx]-[CoOy] 堆叠。磁性、磁阻和共振X射线磁衍射测量表明，上述GBCO薄膜的磁性能受到广泛的调制。通过GBCO薄膜的离子序控制，观察到不同的磁相变行为和磁各向异性从面内方向到垂直方向的转变。
Double-perovskite GdBaCo2O5.5(GBCO) exhibits various fascinating features, including temperature- and magnetic-field-induced ferromagnetic to antiferromagnetic phase transition associated with the two ionic orders: an A-site Gd/Ba order along thec-axis, and an octahedral CoO6/pyramidal CoO5order along theb-axis. However, the fine control of ionic orders remains a challenging issue. Herein, we demonstrate the engineering of ionic orders in GBCO films through appropriate selection of substrates. Specifically, we prepared four kinds of films comprising only the Gd/Ba order [on SrTiO3(001)], only the CoO6/CoO5order [on LaSrGaO4(001)], and both the Gd/Ba and CoO6/CoO5orders [on NdGaO3(110) and LaSrAlO4(001) (LSAO)]. In addition to the selective ionic orders through substrate selection, the GBCO film on LSAO also contained multiple domains with domain boundaries of [CoOx]–[CoOy] stacking. Magnetic, magnetoresistance, and resonant X-ray magnetic diffraction measurements revealed that the magnetic properties of the above GBCO films were widely modulated. With the ionic order control of the GBCO film, different magnetic phase transition behaviors and magnetic anisotropy switching from the in-plane to perpendicular direction were observed.