Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-08-23
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 fugures; to appear in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.91.167202
Ti NMR spectra of LaTiO3 are reexamined and the orbital state of this compound is discussed. The NMR spectra of LaTiO3 taken at 1.5 K under zero external field indicate a large nuclear quadrupole splitting. This splitting is ascribed to the presence of the rather large quadrupole moment of 3d electrons at Ti sites, suggesting that the orbital liquid model proposed for LaTiO3 is inappropriate. The NMR spectra are well explained by the orbital ordering model expressed approximately as $1/\sqrt{3}(d_{xy}+d_{yz}+d_{zx})$ originating from a crystal field effect. It is also shown that most of the orbital moment is quenched.
Itoh Masayuki
Kiyama Takashi
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