Evolution and control of the phase competition morphology in a manganite film.
Evolution and control of the phase competition morphology in a manganite film.
复制标题
锰酸盐薄膜中相竞争形貌的演化与控制
DOI：
10.1038/ncomms9980
复制
发表时间：
2015-11-25
影响因子：
16.6
通讯作者：
Wu W
中科院分区：
文献类型：
--
作者：
Zhou H;Wang L;Hou Y;Huang Z;Lu Q;Wu W
在电荷、自旋、轨道和晶格自由度的相互作用下，钙钛矿锰矿中不同相之间的竞争是明显的，因为它们的能量非常接近。为了揭示潜在相互作用的作用，许多努力都致力于在微观尺度上直接成像相变。在这里，我们展示了使用自制的磁力显微镜，在应变相分离的锰矿膜中，纯铁磁金属在电场降低或温度升高的情况下，电荷有序绝缘体（COI）相变的图像。与COI熔融转变相比，这种反向转变是尖锐的，合作的，类似马氏体的，具有惊人的独特而多样的形态。COI结构域在不同温度下呈变维生长，其分布可以说明锰中潜在相互作用的微妙平衡。我们的研究结果还显示了相位域工程是可能的，以及如何以可控的方式调整相位竞争。
The competition among different phases in perovskite manganites is pronounced since their energies are very close under the interplay of charge, spin, orbital and lattice degrees of freedom. To reveal the roles of underlying interactions, many efforts have been devoted towards directly imaging phase transitions at microscopic scales. Here we show images of the charge-ordered insulator (COI) phase transition from a pure ferromagnetic metal with reducing field or increasing temperature in a strained phase-separated manganite film, using a home-built magnetic force microscope. Compared with the COI melting transition, this reverse transition is sharp, cooperative and martensitic-like with astonishingly unique yet diverse morphologies. The COI domains show variable-dimensional growth at different temperatures and their distribution can illustrate the delicate balance of the underlying interactions in manganites. Our findings also display how phase domain engineering is possible and how the phase competition can be tuned in a controllable manner.