Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-06-23
Prog. Theor. Phys. Suppl. 159, 314 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 2 figures, proceedings submitted to QSS04
Scientific paper
10.1143/PTPS.159.314
Transition metal oxides whose lattice structure has edge-sharing network of octahedra constitute a diverse group of intriguing materials besides compounds with corner-sharing octahedra such as perovskites. We present a theoretical investigation of the interplay among spin, orbital and lattice degrees of freedom in these materials. We focus on $t_{2g}$ electron systems where a keen competition among those degrees of freedom is expected to emerge under a relatively weak Jahn-Teller coupling. We study the interplay between spin and orbital degrees of freedom in vanadium spinels and titanium pyroxenes. We clarify the important role of the strong anisotropy in the orbital interactions due to the edge-sharing geometry. We also discuss the interplay between spin and lattice in chromium spinels focusing on the magnetization process under the external magnetic field.
Hikihara Toshiya
Motome Yukitoshi
Penc Karlo
Shannon Nic
Tsunetsugu Hirokazu
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