Anisotropic-strain-induced monoclinic distortion and robust charge-ordering in ultrathin Pr0.5Sr0.5MnO3 films

被引：9
作者：
Yin, Zhizhen [1 ]
Huang, Zhen [1 ]
Gao, Guanyin [1 ]
Wu, Wenbin [1 ]
Wang, Guoyu [2 ]
Wang, Yu [2 ]
机构：
[1] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China
[2] Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China
来源：
JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2009年 / 42卷 / 06期
关键词：
MANGANITES; TRANSITION; STATE; PHASE; SIZE;
D O I：
10.1088/0022-3727/42/6/062004
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Ultrathin Pr0.5Sr0.5MnO3 films 4-12 nm thick were grown on (LaAlO3)(0.3)(Sr2AlTaO6)(0.7)(110) substrates and their thickness-dependent properties were probed. Using high-resolution off-specular x-ray reciprocal space mapping on (130), (310), (222) and (22 (2) over bar) reflections, we clearly show that these films have a single-crystalline and a single-domain-like structure, suffering a monoclinic distortion (M-A) with the unique axis b(m) along [-110] due to the in-plane anisotropic strain. With increasing film thickness, while the paramagnetic-ferromagnetic transition temperature increases, the antiferromagnetic charge-orbital ordering ( COO) temperature decreases. More strikingly, the ultrathin films show a much more robust COO ground state than in the bulk or thick films, with the melting field higher than 14 T for the 4 nm films.
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页数：5
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