Physics – Condensed Matter – Materials Science
Scientific paper
2001-03-09
J. Phys. Soc. Jpn., 70, 3356 (2001).
Physics
Condensed Matter
Materials Science
3 figures
Scientific paper
10.1143/JPSJ.70.3356
To gain insights into the fundamental and characteristic features of the surface of doped manganites, we constructed a general magnetic phase diagram of La$_{1-x}$Sr$_{x}$MnO$_3$ (001) surfaces in the plane spanned by $x$ and the bulk tetragonal distortion $c/a$, from the first-principles calculations. We found that the surfaces are quite different from the bulk in the sense that both the (La, Sr)O and MnO$_2$ terminated surfaces show strong tendency toward antiferromagnetism (A-type and C-type respectively). The basic physics governing the phase diagram can be understood in terms of the surface orbital polarizations. It is also found that the strong surface segregation of Sr atoms is mostly caused by the electrostatic interaction and will further enhance the tendency to surface antiferromagnetism.
Fang Zhong
Terakura Kiyoyuki
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