Magnetoelastic Properties of La0.744Ba0.186MnO3Single Crystals

M agnet oelasti c prop erties of La 0: 7 44 Ba 0 : 18 6 Mn O3 single cr ystals ha ve b een studied .T he basic magneto elastic constants of the crystal ha ve been estimated using the data of magnetostrictio n and magneti zatio n measurements , which ha ve been carried out in [010] and [110] crystallograph ic directions in a w ide temp erature range from 10 K to 150 K .T he anomaly of the thermal expansion has been observed at ab out 185 K .N ear this anomaly tw o almost degenerated phase transitions ha ve been observed.O ne of these transitions may be related to the structural phase transition, w hile the second one to the occurrence of spontaneous strains.T he magnetostricti on of La 0: 744 Ba 0 : 186 MnO 3 single crystal seems to arise due to the e˜ect of applie d Ùeld on the spontaneous strains.