Cation-ordering effects in the single layered manganite La(2/3)Sr(4/3)MnO4

Details Cation-ordering effects in the single layered manganite La(2/3)Sr(4/3)MnO4 Cation-ordering effects in the single layered manganite La(2/3)Sr(4/3)MnO4

2010-10-03

arxiv.org/abs/1010.0372v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 figures

Scientific paper

We have synthesized epitaxial La(1-x)Sr(1+x)MnO4 (x=1/3) films as random alloys and cation-ordered analogues to probe how cation order affects the properties of a 2D manganite. The films show weak ferromagnetic ordering up to 130 K, although there is a dramatic difference in magnetic anisotropy depending on the cation order. While all films exhibit similar gapped insulator behavior above 130 K, there is a significant difference in the low temperature transport mechanism depending on the cation order. Differences in magnetic anisotropy and low temperature transport are consistent with differences in Mn 3d orbital occupancies. Together this work suggests that cation ordering can significantly alter the Mn 3d orbital ground state in these correlated electron systems.

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