Specific features of spin, charge, and orbital ordering in cobaltites
2009; Institute of Physics; Volume: 52; Issue: 8 Linguagem: Inglês
10.3367/ufne.0179.200908b.0837
ISSN1468-4780
AutoresNatal'ya B Ivanova, С. Г. Овчинников, M. M. Korshunov, Ilya Eremin, Natal'ya V Kazak,
Tópico(s)Advanced Condensed Matter Physics
ResumoComplex cobalt oxides known as cobaltites are reviewed, including LnCoO3-based perovskite-structured rare-earth cobaltites (where Ln is lanthanum or a lanthanide), quasi-two-dimensional and quasi-one-dimensional cobaltites of the types LnCo2O5+?, La2CoO4, and Ca3Co2O8, and NaxCoO2 ? yH2O superconducting compounds. Key experimental and theoretical results are presented, with emphasis on the interplay between charge, spin, and orbital degrees of freedom. Two problems of specific relevance to cobaltites ? the spin state instability of Co3+ ions in LnCoO3, and the nature of superconductivity in NaxCoO2 ? yH2O ? are also given significant attention.
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