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植松 大介*; 佐賀山 基*; 有馬 孝尚*; 石川 洵*; 中辻 知*; 高木 英典*; 吉田 雅洋*; 水木 純一郎; 石井 賢司
Physical Review B, 92(9), p.094405_1 - 094405_6, 2015/09
被引用回数:23 パーセンタイル:66.54(Materials Science, Multidisciplinary)The half-filled topmost valence band of Ir in several iridates such as SrIrO, IrO, and CaIrO has been proposed to originate mainly from the spin-orbit coupled states. In pyrochlore iridates IrO (: rare earth), some exotic electronic states are theoretically proposed by assuming states. However, the octahedral coordination around Ir is trigonally distorted, which may affect the energy level scheme of Ir states. Here, we report spectra of resonant elastic and inelastic X-ray scattering in EuIrO at the Ir edges. A large suppression of the magnetic scattering signal at the Ir edge supports the picture rather than the one. The inelastic scattering spectrum indicates that the magnitude of the trigonal field on the Ir states is evaluated to be comparable to the spin-orbit interaction. The energy diagram of the state is proposed based on the simple cluster model.
植松 大輔*; 左右田 稔*; 小林 義明*; 佐藤 正俊*; 井川 直樹; 加倉井 和久
Journal of the Physical Society of Japan, 75(12), p.124601_1 - 124601_5, 2006/12
被引用回数:0 パーセンタイル:0(Physics, Multidisciplinary)X線及び中性子回折,磁気測定によりAgCuOの70K相転移における格子歪みと磁気秩序の強い相関が検証された。この系は角共有のCu四面体からなるパイロクロア型の構造を持ち、幾何学的なフラストレーションを示す。この系で格子歪みによりフラストレーションが解消され、磁気秩序が安定化することが明らかになった。