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We report the magnetic field dependence of resistivity ($\rho$) and specificheat ($C$) for the non-superconducting PrFeAsO compound. Our study shows ahitherto unobserved anomaly at $T_{SR}$ in the resistivity and specific heatdata which arises as a result of the interplay of antiferromagnetic (AFM) Prand Fe sublattices. Below the AFM transition temperature ($T_N^{\rm{Pr}}$), Prmoment orders along the crystallographic c axis and its effect on the ironsubsystem causes a reorientation of the ordered inplane Fe moments in adirection out of the $ab$ plane. Application of magnetic field introducesdisorder in the AFM Pr sublattice, which, in turn, reduces the out-of-planePr-Fe exchange interaction responsible for Fe spin reorientation. Both in$\rho$($T$) and $d(C/T)/dT$ curves, the peak at $T_{SR}$ broadens with theincrease of $H$ due to the introduction of the disorder in the AFM Prsublattice by magnetic field. In $\rho$($T$) curve, the peak shifts towardslower temperature with $H$ and disappears above 6 T while in $d(C/T)/dT$ curvethe peak remains visible up to 14 T. The broadening of the anomaly at$T_N^{\rm{Pr}}$ in $C(T)$ with increasing $H$ further confirms that magneticfield induces disorder in the AFM Pr sublattice.

Fe-spin reorientation in PrFeAsO : Evidences from resistivity and specific heat studies