  We report on the temperature dependent Raman spectroscopic studies of
orthorombic distorted perovskite YCrO3 in the temperature range of 20-300K.
Temperature dependence of DC-magnetization measurement under field cooled and
zero field cooled modes confirmed the transition temperature (TN ~142K) and
anomalous characteristic temperature (T* ~60K), above which magnetization tends
to saturate. Magnetization isotherm recorded below TN at 125K shows clear loop
opening without magnetization saturation up to 20kOe, indicating the
coexistence of antiferromagnetic (AFM) interaction with weak ferromagnetic
(WFM) phase. Mean field calculation for exchange constants further confirms the
complex magnetic phase below TN. Temperature evolution of lineshape parameters
of selected modes (associated with the octahedral rotation and A-shift in the
unit cell) revealed anomalous phonon shift near Cr3+ magnetic ordering
temperature (TN ~142K). Additional phonon anomaly was identified at T* ~60K in
agreement with the magnetization results and reflects the change in spin
dynamics, plausibly due to the change in Cr-spin configuration. Moreover, the
positive and negative shift in Raman frequency below TN revel the existence of
competing WFM and AFM exchanges. The phonon shift of B3g (3)-octahedral
rotation mode fairly scaled with the square of sublattice magnetization from TN
to T*, below which it start to depart from theconventional behaviour and need
further attention. This correlation between magnetic and Raman data elucidate
the spin-phonon coupling owing to the multiferroic phenomenon in YCrO3.
