強相関酸化物BaIrO_3におけるモット絶縁体-電荷移動型絶縁体転移の圧力効果 Mott-Insulator to Charge-Transferred Insulator Transition in the Strongly Correlated Oxide BaIrO_3
The strongly correlated Ir oxide BaIrO<SUB>3</SUB> shows a weak ferromagnetism and a gap-type order below the transition temperature <i>T<SUB></i>c</SUB>(= 180 K at ambient pressure). An external pressure decreases <i>T<SUB></i>c</SUB> by a rate of -29 K/GPa, removes the metallic conduction below <i>T<SUB></i>c</SUB>, and suppresses the nonlinear conduction at 4.2 K. These observations are highly incompatible with a charge-density-wave state that was believed to be the origin for the 180-K transition. An alternative model for the transition is proposed, which can be regarded as a transition from the Mott-insulator to the charge-transferred insulator transition.
- 高圧力の科学と技術 = The Review of high pressure science and technology
高圧力の科学と技術 = The Review of high pressure science and technology 18(1), 62-68, 2008-02-20
The Japan Society of High Pressure Science and Technology