逆光飞翔iA new pyrochlore ruthenium oxide, Hg2Ru2O7 was synthesized under a high pressure of 6 GPa. In contrast to the extensively studied Ru4+ oxides, this compound possesses a novel Ru5+ valence state, corresponding to a half-filled t_2g_3 electron configuration.
10
Fig. 2 (Color online) Temperature dependence of electrical resistivity (top), dc-susceptibility (center), and thermoelectric power (bottom) for Hg 2Ru 2O 7. The insets in the top and center panels display an enlarged regions showing the hysteresis associated with a first order transition. The inset in the bottom panel displays the specific heat peak observed at the MIT. In the center panel, a small amount of impurity contribution (~5% of the signal) was subtracted from the susceptibility data.
