Work

Suppression of metal-insulator transition at high pressure and pressure-induced magnetic ordering in pyrochlore oxide Nd 2 Ir 2 O 7

Year: 2011

Type: article

Abstract: We report the pressure dependence of electrical resistance $R$($T$) of a frustrated pyrochlore oxide Nd${}_{2}$Ir${}_{2}$O${}_{7}$, which shows a second-order metal-insulator transition (MIT) at 36 K. This MIT is monotonically suppressed by the application of pressure. The insulating phase disappears at around 10 GPa. Then, in the pressure-induced metallic state above 10 GPa, a new pressure-induced phase transition emerges at around 3 K, which is characterized by a resistance drop. The new phase transition is due to a ferromagnetic (FM) ordering, which is suggested to be an ordered spin ice (two-in two-out) state of the Nd moment via the RKKY interaction. We succeeded in observing the phase competition between the MIT and the FM ordering by the application of high pressure.

Source: Physical Review B

DOI: 10.1103/physrevb.83.041102