Orbitally ordered state in Y1-xCaxTiO3 (0 < x ≤ 0.5)

• Published in: Journal of the Physical Society of Japan 2004-10, Vol.73 (10), p.2620-2623
• Main Authors: NAKAO, Hironori, TSUBOTA, Masami, IGA, Fumitoshi, UCHIHIRA, Kazuyuki, NAKANO, Toshihiro, TAKABATAKE, Toshiro, KATO, Kenichi, MURAKAMI, Youichi
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron states; Exact sciences and technology; Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Metal-insulator transitions and other electronic transitions; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other interactions of matter with particles and radiation; Physics; X-ray absorption and absorption edges; X-ray absorption spectra
• ISSN: 0031-9015; 1347-4073
• DOI: 10.1143/JPSJ.73.2620

Orbitally ordered states of a Ti t2g-electron in Y1-xCaxTiO3 (03d transition energy (pre-edge) reflecting the 3d-orbital ordering markedly decrease with increasing Ca concentration toward the ferromagnetic-paramagnetic phase boundary (xFP∼0.15). The intensity remaining above xFP decreases gradually and almost disappears at the metal-insulator transition (xMI∼0.4). Namely, it is suggested that the orbital ordering is strongly suppressed toward xFP, and vanishes at xMI. The Ca concentration dependence of the Jahn-Teller distortion determined by X-ray structural analysis is consistent with the orbital state obtained by the RXS experiment.