Mott-Anderson transition controlled by a magnetic field in pyrochlore molybdate.
Mott-Anderson transition controlled by a magnetic field in pyrochlore molybdate.
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DOI：
10.1103/physrevlett.96.116403
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发表时间：
2006-03
影响因子：
8.6
通讯作者：
N. Hanasaki;M. Kinuhara;I. Kézsmárki;S. Iguchi;S. Miyasaka;N. Takeshita;C. Terakura;H. Takagi;Y. Tokura
中科院分区：
文献类型：
--
作者：
N. Hanasaki;M. Kinuhara;I. Kézsmárki;S. Iguchi;S. Miyasaka;N. Takeshita;C. Terakura;H. Takagi;Y. Tokura
烧绿石相Gd_2 MO_2 O_7位于铁磁金属态和自旋玻璃绝缘态的相界附近。这种金属-绝缘体转变在很大的能量尺度上由电子相关效应控制，而几何阻挫引起随机势。磁场可以调节势的随机性，并在适当的压力下精确地控制连续的Mott-Anderson转变。确定了该铁磁轨道简并电子系统的Mott-Anderson跃迁临界指数（μ = 1.04 +/-0.1）。
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.