Magnetic properties lithium-doped manganite single crystals

S. N. Barilo, G. L. Bychkov, V. I. Gatalskaya, L. A. Kurochkin, and V. P. Sokol

Institute of Solid State and Semiconductor Physics of National Academy of Science of Belarus 17 P. Brovki Str., Minsk 220072, Belarus
E-mail: bars@ifttp.bas-net.by

H. Szymczak, R. Szymczak, and M. Baran

Institute of Physics of Polish Academy of Science, 32/46 Al. Lotnikov Str., Warsaw 02-668, Poland
E-mail: szymr@ifpan.edu.pl
pos Анотація:

Received October 26, 2000

Magnetic and resistivity properties of La_1-xLi_xMnO₃ single crystals with the perovskite structure at lithium concentrations x=0.06 and 0.2 are investigated over a broad temperature range at fields of up to 50 kOe. The Curie temperature is T_C=90 K (x=0.06) and 300 K (x=0.2), respectively. The electrical resistance of the single crystal with x=0.06 increases steadily with temperature decrease, while the crystal with x=0.2 exhibits a magnetoresistance effect of ~ 8% at an external field of 9 kOe. The different dependence of the magnetizations M_FC and M_ZFC of the sample with lower lithium content in the temperature range below T_C is associated with the formation of a cluster glass and is caused by high coercivity and magnetic anisotropy of the crystal.