Anomalous Magnetotransport Properties of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="italic">R</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi>Mo</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi>O</mi></mrow><mrow><mn>7</mn></mrow></msub></mrow></math></span> near the Magnetic Phase Boundary

T. Katsufuji; H. Ẏ. Hwang; S-W. Cheong

doi:10.1103/PhysRevLett.84.1998

Anomalous Magnetotransport Properties of $R_{2} {Mo}_{2} O_{7}$ near the Magnetic Phase Boundary

T. Katsufuji, H. Ẏ. Hwang, and S-W. Cheong

Phys. Rev. Lett. 84, 1998 – Published 28 February 2000

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.

Received 23 July 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.1998

Authors & Affiliations

T. Katsufuji^*, H. Ẏ. Hwang, and S-W. Cheong^†

Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974

^*Present address: Department of Advanced Materials Science, University of Tokyo, Tokyo 113-8656, Japan.
^†Also Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854.