The crystal structure, magnetization, and resistivity of the La0.8Ba0.2MnO3
single crystal are studied in the vicinity of the structural phase transit
ion point. The x-ray experiments show the Pbnm and R (3) over bar c phases
to coexist at least within the interval 185 < T < 196 K. The thermal hyster
esis of magnetization and resistivity is observed. The interrelations betwe
en structural, magnetic, and resistivity properties are analyzed in terms o
f simple phenomenological theory.