期刊
PHYSICAL REVIEW B
卷 89, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.075107
关键词
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资金
- Spanish Government [MAT2011-29269-CO3, NANOSELECT CSD2007-00041]
- Generalitat de Catalunya [2009 SGR 00376]
- Italian Ministry of Research [FIRB RBAP115AYN]
The magnetotransport phase diagram of half-doped manganites Ln(0.5)A(0.5)MnO(3) (Ln = La3+, Nd3+, etc., and A = Sr2+, Ca2+, etc.) is primarily dictated by the bare conduction bandwith (W-0), which itself is controlled by the Mn-O-Mn bond angle, and the carrier concentration. In thin films, epitaxial strain (epsilon) provides an additional tool to tune W-0 by selecting orbital ordering at fixed carrier concentration. Here, we will show that compressive or tensile epitaxial strain on half-doped manganites can have a tremendous and distinct effect on La0.5Sr0.5MnO3 (LSMO5) and La0.5Ca0.5MnO3 (LCMO5), having broad or narrow W-0, respectively. It is found that in LSMO5, large compressive strain triggers a change from a ferromagnetic and metallic ground state to an insulating and antiferromagnetic state whereas a tensile strain produces an antiferromagnetic but metallic state. In contrast, under strain, LCMO5 remains an antiferromagnetic insulator irrespectively of the strain state. These results illustrate that orbital ordering largely depends on the interplay betweenW(0) and e and provide a guideline towards responsive manganite layers.
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