Magnetoelastic Properties of La 0.744 Ba 0.186 MnO 3 Single Crystals
Yu. Bukhantsev a , Ya.M. Mukovskii b , S. Vasiliev a , B. Kundys a and H. Szymczak a
a Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland
b Moscow State Steel & Alloys Institute, Moscow 117936, Russia
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Magnetoelastic properties of La 0.744 Ba 0.186 MnO 3 single crystals have been studied. The basic magnetoelastic constants of the crystal have been estimated using the data of magnetostriction and magnetization measurements, which have been carried out in [010] and [110] crystallographic directions in a wide temperature range from 10K to 150K. The anomaly of the thermal expansion has been observed at about 185K. Near this anomaly two almost degenerated phase transitions have been observed. One of these transitions may be related to the structural phase transition, while the second one to the occurrence of spontaneous strains. The magnetostriction of La 0.744 Ba 0.186 MnO 3 single crystal seems to arise due to the effect of applied field on the spontaneous strains.
DOI: 10.12693/APhysPolA.105.155
PACS numbers: 75.47.Lx, 75.30.Gw, 75.80.+q