TY - JOUR
T1 - Electron doping in the cubic perovskite SrMnO3
T2 - Isotropic metal versus chainlike ordering of Jahn-Teller polarons
AU - Sakai, H.
AU - Ishiwata, S.
AU - Okuyama, D.
AU - Nakao, A.
AU - Nakao, H.
AU - Murakami, Y.
AU - Taguchi, Y.
AU - Tokura, Y.
PY - 2010/11/17
Y1 - 2010/11/17
N2 - Single crystals of electron-doped SrMnO3 with a cubic perovskite structure have been systematically investigated as the most canonical (orbital-degenerate) double-exchange system, whose ground states have been still theoretically controversial. With only 1-2% electron doping by Ce substitution for Sr, a G -type antiferromagnetic metal with a tiny spin canting in a cubic lattice shows up as the ground state, where the Jahn-Teller polarons with heavy mass are likely to form. Further electron doping above 4%, however, replaces this isotropic metal with an insulator with tetragonal lattice distortion, accompanied by a quasi-one-dimensional 3 z2 - r2 orbital ordering with the C -type antiferromagnetism. The self-organization of such dilute polarons may reflect the critical role of the cooperative Jahn-Teller effect that is most effective in the originally cubic system.
AB - Single crystals of electron-doped SrMnO3 with a cubic perovskite structure have been systematically investigated as the most canonical (orbital-degenerate) double-exchange system, whose ground states have been still theoretically controversial. With only 1-2% electron doping by Ce substitution for Sr, a G -type antiferromagnetic metal with a tiny spin canting in a cubic lattice shows up as the ground state, where the Jahn-Teller polarons with heavy mass are likely to form. Further electron doping above 4%, however, replaces this isotropic metal with an insulator with tetragonal lattice distortion, accompanied by a quasi-one-dimensional 3 z2 - r2 orbital ordering with the C -type antiferromagnetism. The self-organization of such dilute polarons may reflect the critical role of the cooperative Jahn-Teller effect that is most effective in the originally cubic system.
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U2 - 10.1103/PhysRevB.82.180409
DO - 10.1103/PhysRevB.82.180409
M3 - Article
AN - SCOPUS:78649709730
VL - 82
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 18
M1 - 180409
ER -