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Mott-Anderson transition controlled by a magnetic field in pyrochlore molybdate
N Hanasaki1, M Kinuhara, I Kézsmárki
1Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
Abstract:
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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