Orbital ordering and local magnetic properties of Mott-Hubbard insulators YTiO3 and LaTiO3:NMR study

被引：76

作者：

Itoh, M

Tsuchiya, M

Tanaka, H

Motoya, K

机构：

[1] Chiba Univ, Fac Sci, Dept Phys, Inage Ku, Chiba 2638522, Japan

[2] Chiba Univ, Grad Sch Sci & Technol, Inage Ku, Chiba 2638522, Japan

[3] Sci Univ Tokyo, Fac Sci & Technol, Dept Phys, Noda, Chiba 2788510, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1999年 / 68卷 / 08期

关键词：

Mott-Hubbard insulators; YTiO3; LaTiO3; orbital ordering; NMR; hyperfine field;

D O I：

10.1143/JPSJ.68.2783

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Ti-47,Ti-49, Y-89 and La-139 NMR measurements have been performed to study local magnetic properties of the Mott-Hubbard insulators YTiO3 and LaTiO3, In particular, the magnetic structure of the ferromagnetic (antiferromagnetic) state of YTiO3 (LaTiO3) is discussed based on the analysis of Ti-47,Ti-49 frequency-Spectra. We found that the Ti NMR spectrum in YTiO3 is successfully explained by an orbital ordering model proposed by the unrestricted Hartree-Fock and the band calculations. On the other hand, the Ti NMR spectrum in LaTiO3 is explained without orbital ordering. The internal field H-n at the Y site in YTiO3 is due to the supertransferred hyperfine interaction, whereas the H-n at the La site is canceled out because of the local symmetry in the antiferromagnetic state of LaTiO3.

引用

页码：2783 / 2789

页数：7

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