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

Автор(и)

  • I.O. Troyanchuk Scientific-Practical Materials Research Centre NAS of Belarus, Minsk 220072, Belarus
  • D.V. Karpinsky Scientific-Practical Materials Research Centre NAS of Belarus, Minsk 220072, Belarus
  • M.V. Bushinsky Scientific-Practical Materials Research Centre NAS of Belarus, Minsk 220072, Belarus
  • V.A. Sirenko B. Verkin Institute for Low Temperature Physics and Engineering of National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkov 61103, Ukraine
  • V.V. Sikolenko Joint Institute for Nuclear Research, Dubna 141980, Russia
  • A. Franz Helmholtz Zentrum Berlin, Hahn-Meitner-Platz 1, Berlin 14109, Germany

DOI:

https://doi.org/10.1063/1.5001300

Ключові слова:

orbital ordering, exchange interaction, ferromagnetic state, manganites, perovskites.

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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Опубліковано

2017-06-19

Як цитувати

(1)
Troyanchuk, I.; Karpinsky, D.; Bushinsky, M.; Sirenko, V.; Sikolenko, V.; Franz, A. Antiferromagnet-Ferromagnet Transition in La1–xSrxMn0.5Ni0.5O3 (0 ≤ x ≤ 0.2) Ceramics. Fiz. Nizk. Temp. 2017, 43, 1219-1223.

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