G-type antiferromagnetism and orbital ordering due to the crystal field from the rare-earth ions induced by the GdFeO_3-type distortion in RTiO_3 with R=La, Pr, Nd and Sm
| dc.creator | Mochizuki, Masahito | |
| dc.creator | Imada, Masatoshi | |
| dc.date | 2003-12-10 | |
| dc.date | 2003-12-11 | |
| dc.date.accessioned | 2026-07-07T06:21:58Z | |
| dc.date.available | 2026-07-07T06:21:58Z | |
| dc.description | The origin of the antiferromagnetic order and puzzling properties of LaTiO_3 as well as the magnetic phase diagram of the perovskite titanates are studied theoretically. We show that in LaTiO_3, the t_{2g} degeneracy is eventually lifted by the La cations in the GdFeO_3-type structure, which generates a crystal field with nearly trigonal symmetry. This allows the description of the low-energy structure of LaTiO_3 by a single-band Hubbard model as a good starting point. The lowest-orbital occupation in this crystal field stabilizes the AFM(G) state, and well explains the spin-wave spectrum of LaTiO_3 obtained by the neutron scattering experiment. The orbital-spin structures for RTiO_3 with R=Pr, Nd and Sm are also accounted for by the same mechanism. We point out that through generating the R crystal field, the GdFeO_3-type distortion has a universal relevance in determining the orbital-spin structure of the perovskite compounds in competition with the Jahn-Teller mechanism, which has been overlooked in the literature. Since the GdFeO_3-type distortion is a universal phenomenon as is seen in a large number of perovskite compounds, this mechanism may also play important roles in other compounds of this type. | |
| dc.description | 20 pages, 15 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0312244 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0312244 | |
| dc.identifier | J. Phys. Soc. Jpn. 73 (2004) 1833 | |
| dc.identifier | doi:10.1143/JPSJ.73.1833 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/95772 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | G-type antiferromagnetism and orbital ordering due to the crystal field from the rare-earth ions induced by the GdFeO_3-type distortion in RTiO_3 with R=La, Pr, Nd and Sm | |
| dc.type | text |