Effect of Electrical Current on Magnetic and Transport Properties of Single-Crystalline La $_{0.82}$Ca $_{0.18}$MnO $_{3}$

AC susceptibility and voltage relaxation behaviors after current pulses were studied at various passing through currents for La
_0.82
Ca
_0.18
MnO
₃
single crystals. It was found that a current of 10 mA caused a significant temperature shift towards lower temperatures on the ac-susceptibility versus temperature curve when measured in a cryostat, while the current induced effect was insignificant when the sample is immersed in liquid N
₂
. Exponential decay of voltage was observed after current pulses when measured in the cryostat at 77 K, but the effect was greatly suppressed when measured in liquid N
₂
. The observed results suggest that Joule heating is associated with electrical currents passing through the sample and is the main contribution to the current induced effects.