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

N.B. Ivanova^a, S.G. Ovchinnikov^a, M.M. Korshunov^a, b, I.M. Eremin^b, c, N.V. Kazak^a
^aKirensky 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
^bMax-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, Dresden, D-01187, Germany
^cKazan 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 LnCo₂O_5+δ, La₂CoO₄, and Ca₃Co₂O₈, and Na_xCoO₂ · 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 Na_xCoO₂ · yH₂O also given significant attention.

PACS: 71.30.+h, 75.30.Cr, 75.50.Pp (all)
DOI: 10.3367/UFNe.0179.200908b.0837
URL: https://ufn.ru/en/articles/2009/8/b/
Web of Science

000273727200002
Scopus

2-s2.0-70749152483
ADS NASA

2009PhyU...52..789I
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