Mott-Anderson transition controlled by a magnetic field in pyrochlore molybdate

被引：23
|
作者：
Hanasaki, N [1 ]
Kinuhara, M
Kézsmárki, I
Iguchi, S
Miyasaka, S
Takeshita, N
Terakura, C
Takagi, H
Tokura, Y
机构：
[1] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan
[2] ERATO, Japan Sci & Technol Agcy, Spin Superstruct Proj, Tsukuba, Ibaraki 3058562, Japan
[3] Natl Inst Adv Ind Sci & Technol, Correlated Elect Res Ctr, Tsukuba, Ibaraki 3058562, Japan
[4] Univ Tokyo, Dept Adv Mat Sci, Kashiwa, Chiba 2778581, Japan
来源：
PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 11期
关键词：
D O I：
10.1103/PhysRevLett.96.116403
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The pyrochlore molybdate Gd2Mo2O7 locates near the phase boundary between the ferromagnetic-metallic and the spin-glass insulating state. This metal-insulator transition is governed on a large energy scale by the electron-correlation effect, while the geometrical frustration causes the random potential. The magnetic field can tune the randomness of the potential and control, under a suitable pressure, the continuous Mott-Anderson transition precisely. The critical exponent (mu=1.04 +/- 0.1) of the Mott-Anderson transition has been determined for this ferromagnetic orbital-degenerate electron system.
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页数：4
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