Abstract
We have investigated the effect of hydrostatic pressure on magnetization and magnetocaloric properties of Pr0.6Ca0.4Mn0.96B0.04O3 (B = Co and Cr) polycrystals. At ambient pressure, both the systems undergo a first-order paramagnetic insulator to ferromagnetic metallic transition. On increasing the hydrostatic pressure, the ferromagnetic Curie temperature (TC) shifts towards high temperature at a rate of dTC/dP = 34 K/GPa (23.15 K/GPa) and 31.1 K/GPa (20.7 K/GPa) during cooling (warming) for B = Co and Cr, respectively. While the hysteresis in magnetization decreases with increasing pressure, P = 1 GPa is insufficient to completely suppress the first order transition. The magnetic entropy change (ΔSM) was calculated for various pressures up to 1 GPa and under a magnetic field of μ0H = 1-5 T. The application of pressure, as well as the magnetic field, shifts the peak in ΔSM(T) towards a higher temperature. The maximum value of ΔSM (ΔSMmax) is increased by the magnetic field but decreased by the pressure. It is also observed that while the magnetic field increases the Relative Cooling Power (RCP) of both samples, pressure decreases the RCP of Co doped but does not affect the RCP of Cr doped sample.
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