Magnetic and magnetocaloric properties of the La0.9–xAgxMn1.1O3 compounds

Автор(и)

  • E. Zubov G.V. Kurdyumov Institute for Metal Physics, NASU, 36 Acad. Vernadsky Boulevard, Kyiv 03680, Ukraine
  • A. Pashchenko О.О. Galkin Donetsk Institute of Physics and Engineering, 46 Nauki Ave., Kyiv 03680, Ukraine
  • N. Nedelko Institute of Physics, PAS, Al. Lotników 32/46, Warsaw 02-668, Poland
  • I. Radelytskiy Institute of Physics, PAS, Al. Lotników 32/46, Warsaw 02-668, Poland
  • K. Dyakonov Ioffe Physico-Technical Institute RAS, S.-Petersburg 194021, Russia
  • A. Krzyżewski Institute of Physics, PAS, Al. Lotników 32/46, Warsaw 02-668, Poland
  • A. Ślawska-Waniewska Institute of Physics, PAS, Al. Lotników 32/46, Warsaw 02-668, Poland
  • V. Dyakonov Institute of Physics, PAS, Al. Lotników 32/46, Warsaw 02-668, Poland
  • H. Szymczak Institute of Physics, PAS, Al. Lotników 32/46, Warsaw 02-668, Poland

DOI:

https://doi.org/10.1063/1.5008411

Ключові слова:

La0.9–xAgxMn1.1O3 manganites, magnetization, magnetic entropy, magnetocaloric effect, magnetore-sistance.

Анотація

The influence of Ag+ ions and Mn non-stoichiometry on the magnetic properties and magnetocaloric effect in the La0.9–xAgxMn1.1O3 compounds has been studied. The Ag+ ions content substituting for trivalent lanthanum ions was varied from x = 0.05 to 0.3. Magnetic measurements have been performed over a wide temperature (350–5 K) and magnetic field (up to 5 T) ranges. All the manganites studied show the ferromagnetic-like ordering with a first order magnetic phase transition. The magnetic entropy changes were evaluated from the isothermal curves of magnetization versus an applied magnetic field using both the thermodynamic Maxwell relation (MR) and calculation based on the Landau theory of phase transitions. The largest values of the magnetocaloric effect as well as the relative cooling power among the studied manganites are equal to 5.76 J/(kg·K) and 185 J/kg, respectively, for La0.7Ag0.2Mn1.1O3 in the magnetic field change of 5 T near the Curie temperature of TC = 271 K. A good correlation between the magnetization, colossal magnetoresistance and magnetic entropy changes as a function of Ag concentration in the La0.9–xAgxMn1.1O3 manganites was established.

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Опубліковано

2017-08-22

Як цитувати

(1)
Zubov, E.; Pashchenko, A.; Nedelko, N.; Radelytskiy, I.; Dyakonov, K.; Krzyżewski, A.; Ślawska-Waniewska, A.; Dyakonov, V.; Szymczak, H. Magnetic and Magnetocaloric Properties of the La0.9–xAgxMn1.1O3 Compounds. Fiz. Nizk. Temp. 2017, 43, 1493-1499.

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Розділ

Низькотемпературний магнетизм

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