We study combined effect of hydrostatic pressure and magnetic field on the magnetization of La${ _{ 0.5}}$Ca${ _{ 0.5}}$MnO${ _{ 3}}$. We do not observe any significant effect of pressure on the paramagnetic to ferromagnetic transition. However, pressure asymmetrically affects the thermal hysteresis across the ferro-antiferromagnetic first-order transition, which has strong field dependence. Though the supercooling (T*) and superheating (T**) temperatures decrease and the value of magnetization at 5K (M$_{ 5K}$) increases with pressure, T* and M$_{ 5K}$ shows abrupt changes in tiny pressure of 0.68kbar. These anomalies enhance with field. In 7Tesla field, transition to antiferromagnetic phase disappears in 0.68kbar and M$_{ 5K}$ show significant increase. Thereafter, increase in pressure up to $\sim$10kbar has no noticeable effect on the magnetization.
Categories: cond-mat.str-el cond-mat.mtrl-sci