Transition between two ferromagnetic states driven by orbital ordering in La0.88Sr0.12MnO3

被引:250
作者
Endoh, Y [1 ]
Hirota, K
Ishihara, S
Okamoto, S
Murakami, Y
Nishizawa, A
Fukuda, T
Kimura, H
Nojiri, H
Kaneko, K
Maekawa, S
机构
[1] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan
[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[3] KEK, Inst Mat Struct Sci, Photon Factory, Tsukuba, Ibaraki 3050801, Japan
[4] JAERI, Dept Synchrotron Radiat Facil Project, Sayo 6795143, Japan
[5] Japan Sci & Technol Corp, CREST, Tsukuba, Ibaraki 3050047, Japan
关键词
D O I
10.1103/PhysRevLett.82.4328
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A lightly doped manganite La0.88Sr0.12MnO3 exhibits a phase transition at T-OO = 145 K from a ferromagnetic metal (T-C = 172 K) to a novel ferromagnetic insulator. We identify that the key parameter in the transition is the orbital degree of freedom in e(g) electrons. By utilizing the resonant x-ray scattering, orbital orderings is directly detected below Too, in spite of a significant diminution of the cooperative Jahn-Teller distortion. The experimental features are well described by a theory treating the orbital degree of freedom under strong electron correlation. The present studies uncover a crucial role of the orbital degree of freedom in the metal-insulator transition in lightly doped manganites. [S0031-9007(99)09213-3].
引用
收藏
页码:4328 / 4331
页数:4
相关论文
共 27 条
[1]   CONSIDERATIONS ON DOUBLE EXCHANGE [J].
ANDERSON, PW ;
HASEGAWA, H .
PHYSICAL REVIEW, 1955, 100 (02) :675-681
[2]   Lattice effects and magnetic order in the canted ferromagnetic insulator La(0.87)5Sr(0.125)MnO(3+delta) [J].
Argyriou, DN ;
Mitchell, JF ;
Potter, CD ;
Hinks, DG ;
Jorgensen, JD ;
Bader, SD .
PHYSICAL REVIEW LETTERS, 1996, 76 (20) :3826-3829
[3]  
COX DL, UNPUB
[4]   EFFECTS OF DOUBLE EXCHANGE IN MAGNETIC CRYSTALS [J].
DEGENNES, PG .
PHYSICAL REVIEW, 1960, 118 (01) :141-154
[5]  
FUKUDA T, UNPUB
[6]   THEORY OF THE ROLE OF COVALENCE IN THE PEROVSKITE-TYPE MANGANITES [LA,M(II)]MNO3 [J].
GOODENOUGH, JB .
PHYSICAL REVIEW, 1955, 100 (02) :564-573
[7]   Two-dimensional planar ferromagnetic coupling in LaMnO3 [J].
Hirota, K ;
Kaneko, N ;
Nishizawa, A ;
Endoh, Y .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1996, 65 (12) :3736-3739
[8]   Neutron-scattering studies of magnetic excitations in La1-xSrxMnO3: A dimensional crossover [J].
Hirota, K ;
Kaneko, N ;
Nishizawa, A ;
Endoh, Y ;
Martin, MC ;
Shirane, G .
PHYSICA B, 1997, 237 :36-38
[9]  
INAMI T, IN PRESS
[10]   Polarization dependence of anomalous x-ray scattering in orbital-ordered manganites [J].
Ishihara, S ;
Maekawa, S .
PHYSICAL REVIEW B, 1998, 58 (20) :13442-13451