Reviews of topical problems

Specific features of spin, charge, and orbital ordering in cobaltites

 a,  a,  a, b,  b, c,  a
a Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Academgorodok 50, str. 38, Krasnoyarsk, 660036, Russian Federation
b Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, Dresden, D-01187, Germany
c Kazan State University, ul. Lenina 18, Kazan, 420008, Russian Federation

Complex 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+δ, 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 also given significant attention.

Fulltext is available at IOP
PACS: 71.30.+h, 75.30.Cr, 75.50.Pp (all)
DOI: 10.3367/UFNe.0179.200908b.0837
Citation: Ivanova N B, Ovchinnikov S G, Korshunov M M, Eremin I M, Kazak N V "Specific features of spin, charge, and orbital ordering in cobaltites" Phys. Usp. 52 789–810 (2009)
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Оригинал: Иванова Н Б, Овчинников С Г, Коршунов М М, Ерёмин И М, Казак Н В «Особенности спинового, зарядового и орбитального упорядочений в кобальтитах» УФН 179 837–860 (2009); DOI: 10.3367/UFNr.0179.200908b.0837

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