Authors Referees APS Members |
January 2008, to be published in Physical Review B1
Magnetic-polaron-driven magnetoresistance in the pyrochlore Lu$_{2}$V$_{2}$O$_{7}$
The structural, magnetic, and transport properties of single crystalline Lu$_{2}$V$_{2}$O$_{7}$ are studied. Lu$_{2}$V$_{2}$O$_{7}$ shows a ferromagnetic transition at \Tc~= 69.5 K and a negative magnetoresistance (MR) as high as 50 percent at \TS~= 75 K with an applied field of 5 T. Through various experiments, it is demonstrated that the mechanism for the MR is not through double-exchange, but through a polaron mediated behavior similar to Tl$_{2}$Mn$_{2}$O$_{7}$. This places Lu$_{2}$V$_{2}$O$_{7}$ as the only other example of polaron mediated MR among the pyrochlore oxides. © 2008 The American Physical Society.
|
