Imaging the formation and surface phase separation of the CE phase
Imaging the formation and surface phase separation of the CE phase
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DOI：
10.1038/s41535-021-00353-2
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发表时间：
2021-06
影响因子：
5.7
通讯作者：
Haibiao Zhou;Qiyuan Feng;Yubin Hou;M. Nakamura;Y. Tokura;M. Kawasaki;Z. Sheng;Q. Lu
中科院分区：
文献类型：
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作者：
Haibiao Zhou;Qiyuan Feng;Yubin Hou;M. Nakamura;Y. Tokura;M. Kawasaki;Z. Sheng;Q. Lu
CE相是一种特殊的相，由于强的电子关联，它同时表现出自旋、电荷和轨道有序。它是研究多重有序在相变中的作用和发现涌现性质的理想平台。在这里，我们使用低温高场磁力显微镜对Pr0.5Ca0.5MnO_3薄膜中Ce相的相变和性质进行成像。在强磁场下，我们观察到在电荷有序绝缘体转变温度(TCOI)时磁化率明显受到抑制，而在内尔温度(TN)时，磁化率没有明显变化。这一观察结果支持在TCOI之下发展出强反铁磁关联的情况，但也提出了关于齐纳极化子顺磁相图的问题。此外，我们还发现在CE3相区存在相分离的表面态。铁磁相域存在于表面，在零磁场中已经存在，并表现出超高的磁各向异性。我们的结果提供了对非传统的自旋和电荷有序转变的微观洞察，并揭示了CE期的基本属性，突出了当涉及多个电子有序时的异常行为。
TheCEphase is an extraordinary phase exhibiting the simultaneous spin, charge, and orbital ordering due to strong electron correlation. It is an ideal platform to investigate the role of the multiple orderings in the phase transitions and discover emergent properties. Here, we use a cryogenic high-field magnetic force microscope to image the phase transitions and properties of theCEphase in a Pr0.5Ca0.5MnO3thin film. In a high magnetic field, we observed a clear suppression of magnetic susceptibility at the charge-ordering insulator transition temperature (TCOI), whereas, at the Néel temperature (TN), no significant change is observed. This observation favors the scenario of strong antiferromagnetic correlation developed belowTCOIbut raises questions about the Zener polaron paramagnetic phase picture. Besides, we discoverd a phase-separated surface state in theCEphase regime. Ferromagnetic phase domains residing at the surface already exist in zero magnetic field and show ultra-high magnetic anisotropy. Our results provide microscopic insights into the unconventional spin- and charge-ordering transitions and revealed essential attributes of theCEphase, highlighting unusual behaviors when multiple electronic orderings are involved.