  Point-contact (PC) investigations of the heavy-fermion (HF) superconductor
PrOs4Sb12 in the temperature range between 1.5 and 4.2K and in a magnetic field
up to 8T are presented. The main feature in PC spectra, the second derivative
of the I-V curves, in the normal state is a peak at about 1-3mV. This low
energy peak is smeared by the temperature rise and suppressed (or splitted) by
a magnetic field. The origin of the peak is likely excitation of the Pr^3+ ion
from the ground $\Gamma_1$ state to the upper $\Gamma_5$ state, considering the
generally accepted crystalline electric field (CEF) schema in PrOs4Sb12.
Absence of the visible features of other CEF transitions in the PC spectra
testifies to the dominant coupling of the conducting electrons with this
low-lying (about 1meV in energy) excitation. Thus, this interaction is
important for ascertainment of the nature of HF and superconducting state in
PrOs4Sb12.
