Orbital Ordering and Local Magnetic Properties of Mott-Hubbard Insulators YTiO 3 and LaTiO 3: NMR Study
Orbital Ordering and Local Magnetic Properties of Mott-Hubbard Insulators YTiO 3 and LaTiO 3: NMR Study
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Mott-Hubbard 绝缘体 YTiO 3 和 LaTiO 3 的轨道有序性和局域磁性能：NMR 研究
DOI：
10.1143/jpsj.68.2783
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发表时间：
1999
影响因子：
1.7
通讯作者：
K. Motoya
中科院分区：
文献类型：
--
作者：
M. Itoh;M. Tsuchiya;Hirotaka Tanaka;K. Motoya
用47、49 Ti、89 Y和139 La NMR研究了Mott-Hubbard绝缘体YTiO 3和LaTiO 3的局域磁性质。通过对47，49 Ti扫频NMR谱的分析，讨论了YTiO 3（LaTiO 3）铁磁（反铁磁）态的磁结构。我们发现YTiO 3的Ti NMR谱可以用Hartree-Fock轨道有序模型和能带计算成功地解释。另一方面，在没有轨道有序的情况下解释了LaTiO 3的Ti NMR谱。YTiO 3中Y位的内场Hn是由超转移超精细相互作用引起的，而LaTiO 3中La位的内场Hn由于反铁磁态的局域对称性而被抵消.
47,49 Ti, 89 Y and 139 La NMR measurements have been performed to study local magnetic properties of the Mott-Hubbard insulators YTiO 3 and LaTiO 3 . In particular, the magnetic structure of the ferromagnetic (antiferromagnetic) state of YTiO 3 (LaTiO 3 ) is discussed based on the analysis of 47,49 Ti frequency-swept NMR spectra. We found that the Ti NMR spectrum in YTiO 3 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 LaTiO 3 is explained without orbital ordering. The internal field H n at the Y site in YTiO 3 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 LaTiO 3 .
影响因子：
8.6
作者：
TOKURA, Y;TAGUCHI, Y;IYE, Y
通讯作者：
IYE, Y