Grain size effect on magnetic properties of REMnO3 (RE = Pr, Nd)

Автор(и)

  • V. Dyakonov Institute of Physics, PAS, 32/46 Al. Lotników, Warszawa 02-68, Poland
  • A. Szytuła M. Smoluchowski Institute of Physics, Jagiellonian University, 4 Reymonta, Kraków 30-059, Poland
  • S. Baran M. Smoluchowski Institute of Physics, Jagiellonian University, 4 Reymonta, Kraków 30-059, Poland
  • K. Dyakonov A.F. Ioffe Physico-Technical Institute RAN, 26 Politekhnicheskaja, St.-Petersburg 194021, Russia
  • E. Zubov A.A. Galkin Donetsk Physico-Technical Institute, National Academy of Sciences of Ukraine 72 R. Luxembourg Str., Donetsk 83114, Ukraine
  • Z. Kravchenko A.A. Galkin Donetsk Physico-Technical Institute, National Academy of Sciences of Ukraine 72 R. Luxembourg Str., Donetsk 83114, Ukraine
  • M. Dul Institute of Physics, Technical University, 1 Podchorążych, Kraków 30-084, Poland
  • R. Duraj Institute of Physics, Technical University, 1 Podchorążych, Kraków 30-084, Poland
  • W. Bażela Institute of Physics, Technical University, 1 Podchorążych, Kraków 30-084, Poland
  • H. Szymczak Institute of Physics, PAS, 32/46 Al. Lotników, Warszawa 02-68, Poland

DOI:

https://doi.org/10.1063/1.4801432

Ключові слова:

x-ray diffraction, magnetic ordering, exchange interactions, nanoparticle, sol-gel method.

Анотація

X-ray diffraction and magnetic using dc and ac methods measurements of the polycrystalline and nanosize REMnO3 (RE = Pr, Nd) powdered samples have been performed. The nanosize manganites were synthesized with a sol-gel method at different (800, 850 and 900 °C) temperatures. The average size of synthesized nanoparticles (from 56 to 89 nm) and polycrystalline powders (above 200 nm) was estimated using the x-ray diffraction data. All the compounds studied crystallize in the orthorhombic crystal structure (space group Pnma) at room temperature with smaller values of the lattice parameters in the nanosamples. The temperature-dependent ac magnetic susceptibilities show a sharp high-temperature peak connected with Mn magnetic moments ordering. The low-temperature maximum of magnetic susceptibility is proposed to be due to the polarization of the rareearth sublattice by an effective exchange field of the Mn ordered sublattice. The antiferromagnetic ordering of Mn sublattice and paramagnetic Curie temperatures as well as the magnetic moment values for the nanosize samples were found to be smaller than those for polycrystalline sample.

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Опубліковано

2013-02-15

Як цитувати

(1)
Dyakonov, V.; Szytuła, A.; Baran, S.; Dyakonov, K.; Zubov, E.; Kravchenko, Z.; Dul, M.; Duraj, R.; Bażela, W.; Szymczak, H. Grain Size Effect on Magnetic Properties of REMnO3 (RE = Pr, Nd). Fiz. Nizk. Temp. 2013, 39, 452-458.

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Низькотемпературний магнетизм

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