title: Anomalous Magnetotransport Properties of R_{2}Mo_{2}O_{7} near the Magnetic Phase Boundary.
abstract: The magnetic and transport properties of pyrochlore R_{2}Mo_{2}O_{7} have been studied with variation of the rare earth ( R). The change of the mean ionic radius of R, which induces change of the lattice structure, determines the magnetic ground state (ferromagnetic or spin glass), and the magnetic phase boundary is correlated with the metal-insulator crossover. Furthermore, we found enhanced magnetoresistance and unusual residual anomalous Hall effect at low temperatures near the phase boundary, which can be attributed to the coexistence of both phases.
authors.affiliation: Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974.
authors.forename: T
authors.initials: T
authors.lastname: Katsufuji
authors.forename: H Y
authors.initials: HY
authors.lastname: Hwang
authors.forename: S W
authors.initials: SW
authors.lastname: Cheong