title: Mott-Anderson transition controlled by a magnetic field in pyrochlore molybdate.
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.
authors.affiliation: Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Hanasaki
authors.forename: M
authors.initials: M
authors.lastname: Kinuhara
authors.forename: I
authors.initials: I
authors.lastname: Kézsmárki
authors.forename: S
authors.initials: S
authors.lastname: Iguchi
authors.forename: S
authors.initials: S
authors.lastname: Miyasaka
authors.forename: N
authors.initials: N
authors.lastname: Takeshita
authors.forename: C
authors.initials: C
authors.lastname: Terakura
authors.forename: H
authors.initials: H
authors.lastname: Takagi
authors.forename: Y
authors.initials: Y
authors.lastname: Tokura