Anisotropic-strain-induced monoclinic distortion and robust charge-ordering in ultrathin Pr0.5Sr0.5MnO3 films
Anisotropic-strain-induced monoclinic distortion and robust charge-ordering in ultrathin Pr0.5Sr0.5MnO3 films
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DOI：
10.1088/0022-3727/42/6/062004
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发表时间：
2009-03
期刊：
影响因子：
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通讯作者：
Zhizhen Yin;Zhen Huang;Guan-Yin GAO;Wenbin Wu;Guoyu Wang;Yu Wang
中科院分区：
文献类型：
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作者：
Zhizhen Yin;Zhen Huang;Guan-Yin GAO;Wenbin Wu;Guoyu Wang;Yu Wang
在(LaAlO3)0.3(Sr2AlTaO6)0.7(110)衬底上生长了厚度为4~12 nm的Pr0.5Sr0.5MnO3超薄薄膜，并对其厚度特性进行了研究。利用(1 3 0)，(3 1 0)，(2 2 2)和反射的高分辨率离镜X射线倒易空间映射，我们清楚地表明这些薄膜具有单晶和单畴结构，由于面内各向异性应变，这些薄膜经历了沿[−1 1 0]唯一轴BM的单斜形失真(MA)。随着薄膜厚度的增加，顺磁-铁磁转变温度升高，反铁磁电荷轨道有序(COO)温度降低。更引人注目的是，与块体和厚膜相比，超薄膜表现出更强的CoO基态，4 nm薄膜的熔融场高于14T。
Ultrathin Pr0.5Sr0.5MnO3 films 4–12 nm thick were grown on (LaAlO3)0.3(Sr2AlTaO6)0.7(1 1 0) substrates and their thickness-dependent properties were probed. Using high-resolution off-specular x-ray reciprocal space mapping on (1 3 0), (3 1 0), (2 2 2) and reflections, we clearly show that these films have a single-crystalline and a single-domain-like structure, suffering a monoclinic distortion (MA) with the unique axis bm along [−1 1 0] 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.