Antiferromagnet–ferromagnet transition in the cobaltites
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
Antiferromagnet–ferromagnet transition in the cobaltites
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| Creator |
Troyanchuk, I.O.
Bushinsky, M.V. Karpinsky, D.V. Sirenko, V.A. |
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| Subject |
Магнетизм
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| Description |
The three series oxygen-deficient cobaltites La₀.₅Ba₀.₅CoO₃₋δ, LnBaCo₂O₅.₅ and Sr₂YCo₄O₁₀.₅ have been studied. It has been shown that La₀.₅Ba₀.₅CoO₃ is an insulating ferromagnet whereas La₀.₅Ba₀.₅CoO₂.₇₅ is a pure antiferromagnet in which the oxygen vacancies are disordered. The oxygen-vacancies ordering leads to appearance of the ferromagnetic component apparently due to a formation of the noncollinear magnetic structure. The antiferromagnet–“ferromagnet” transition is accompanied by a giant magnetoresistance. It is suggested that in the ferromagnetic oxidized compounds Co³⁺ and Co⁴⁺ ions adopt intermediate spin state whereas for antiferromagnetic (Co⁴⁺-free) compositions Co³⁺ ions have high-spin state (pyramids CoO₅) and dominant low-spin state (octahedra CoO₆). In both ferromagnetic and antiferromagnetic compounds the superexchange via oxygen plays an essential role in a formation of the magnetic properties. |
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| Date |
2017-05-21T17:19:48Z
2017-05-21T17:19:48Z 2012 |
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| Type |
Article
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| Identifier |
Antiferromagnet–ferromagnet transition in the cobaltites / I.O. Troyanchuk, M.V. Bushinsky, D.V. Karpinsky // Физика низких температур. — 2012. — Т. 38, № 7. — С. 833-841. — Бібліогр.: 53 назв. — англ.
0132-6414 PACS: 75.50.Dd, 75.30.–m, 75.60.Ej http://dspace.nbuv.gov.ua/handle/123456789/117271 |
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| Language |
en
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| Relation |
Физика низких температур
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| Publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
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