  We carried out temperature and field dependent magnetic measurements to
understand the evolution of magnetic non-collinearity near antiferromagnetic
phase in conjunction with the evolution of magnetic entropy near phase
transition. We observed the maximum change in entropy just before magnetic
ordering of Cr3+ in YCrO3 with the maximum change in magnetic entropy of -0.38
Jkg-1K-1 at 8 Tesla external field. The data is linear in higher fields 3 T - 8
T , whereas it showed deviations in the lower field region. The maximum entropy
change fits well with mean field approximation at higher fields, while the
observed deviation in lower field substantiates the onset of weak
ferromagnetism in YCrO3.
