Abstract
The resistivity behaviors of pyrochlore A2Ir2O7 (A = Gd, Eu, and Sm), all of which exhibit second-order metal-insulator phase transitions (MITs), are investigated under hydrostatic pressures up to ∼ 2.3 GPa. As the pressure increases, the phase transition temperature (TMI) of Gd2Ir2O7 increases while that of Sm2Ir2O7 decreases, which display opposite tendencies. Meanwhile, TMI of Eu2Ir2O7, which lies intermediately between Gd2Ir2O7 and Sm2Ir2O7, varies very slightly with the change of pressure. In addition, with the increase of pressure, the temperature range of the insulating phase in Gd2Ir2O7 expands, while that in Sm2Ir2O7 shrinks, and that in Eu2Ir2O7 almost keeps unchanged. The different pressure effects in A2Ir2O7 systems can be possibly explained by the changes of Ir-O-Ir bond angles.
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