A method is proposed for the calculation of the magnetocaloric effect from
simultaneous measurements of thermal expansion and magnetostriction made in
different regimes (adiabatic and isothermal). The magnitude of the magneto
caloric effect for Sm0.6Sr0.4MnO3 is estimated. It is found that near the C
urie temperature T-C it passes through a maximum to reach a giant value Del
taT = 4.6 K for DeltaB = 0.84 T. In addition, in the neighborhood of T-C, w
e observed colossal magnetoresistance Delta rho/rho = [rho (H) - rho (0)]/r
ho (0) = 72% in a weak magnetic field of 0.84 T, a giant negative volume ma
gnetostriction omega = -5 x 10(-4) in a field of the same strength, and a l
arge change in the sample volume DeltaV/V approximate to 0.1%. (C) 2001 MAI
K "Nauka/lnterperiodica".