Antiferromagnet-ferromagnet transition in La₁–xSrxMn₀.₅Ni₀.₅O₃ (0 ≤ x ≤ 0.2) ceramics

Antiferromagnet-ferromagnet transition in La₁–xSrxMn₀.₅Ni₀.₅O₃ (0 ≤ x ≤ 0.2) ceramics

Troyanchuk, I.O. ; Karpinsky, D.V. ; Bushinsky, M.V. ; Sirenko, V.A. ; Sikolenko, V.V. ; Franz, A.

Тема: Low dimensionality and inhomogeneity effects in quantum matter

Інший ID: PACS: 61.05.F–, 75.50.Dd, 75.30.Et, 75.60.Ej

URI: http://dspace.nbuv.gov.ua/handle/123456789/175140

Посилання: Antiferromagnet-ferromagnet transition in La₁–xSrxMn₀.₅Ni₀.₅O₃ (0 ≤ x ≤ 0.2) ceramics / I.O. Troyanchuk, D.V. Karpinsky, M.V. Bushinsky, V.A. Sirenko, V.V. Sikolenko, A. Franz // Физика низких температур. — 2017. — Т. 43, № 8. — С. 1219-1223. — Бібліогр.: 13 назв. — англ.

Підтримка: Neutron diffraction experiments have been supported by the European Commission under the 7th Framework Programme through the “Research Infrastructure” action of the “Capacities” Programme, NMI3-II Grant No. 283883. Publication is based on the research provided by the grant support of the State Fund For Fundamental Research (Project No. Ф73/4-2017).

Дата: 2017

Завантажень: 277

Antiferromagnet-ferromagnet transition in La₁–xSrxMn₀.₅Ni₀.₅O₃ (0 ≤ x ≤ 0.2) ceramics

Анотація:

Ceramics samples of La₁–xSrxMn₀.₅Ni₀.₅O₃ (0 ≤ x ≤ 0.2) with perovskite structure have been studied by neutron diffraction method, magnetometry and magnetoresistance measurements. Structural data testify a partial order of the Ni and Mn ions in all the compounds in spite of chemical substitution of the La³⁺ ions by Sr²⁺ ones and an increase of the oxidation state of the Ni ions from 2+ towards to 3+ one. Magnetic structure of the compounds changes from ferromagnetic one (specific for the compound with x = 0) to antiferromagnetic (compounds with x ≥ 0.1) while the temperature of a transition into paramagnetic state remains about 270 K for all the samples. Magnetoresistance gradually decreases with temperature increase and strontium content. The results are discussed assuming nearly equal ferromagnetic and antiferromagnetic components of the superexchange interaction Ni²⁺–O–Mn⁴⁺ while the interaction between Ni³⁺ and Mn⁴ ions is considered to be strongly antiferromagnetic.

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