  A coordinated temperature behavior of magnetic susceptibility and internal
friction has been observed in the La2/3Ba1/3MnO3 manganite in the temperature
region of the crystal phase separation 5-340 K. Stepwise temperature behavior
of the susceptibility of the single crystal sample and corresponding singular
behavior of the internal friction in the polycrystalline manganite have been
found. These small-scale features of the temperature dependences of the
susceptibility and the internal friction are considered to be a reflection of
martensitic kinetics of the structural phase transformation R3c-Imma in the 200
K temperature region.
