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We report on the anomalous magnetization reversal under hydrostatic pressurein the lightly electron-doped manganite compound(Ca$_{1-x}$Sr$_{x}$)Mn$_{0.95}$Sb$_{0.05}$O$_{3}$ with its fixed carriercontent. In a weakly magnetic field cooled measurement, diamagneticmagnetization is observed for $x\leq 15\%$, which changes to positive valuesfor $x>15\%$. However, on an application of pressure on the samples with$x=16\%$ and 17$\%$, magnetization reverses sign and diamagnetism is restored.We present a magnetic phase diagram as a function of Sr concentration, underboth ambient and hydrostatic pressures. To understand better thethermodynamical properties of this system, we have measured the specific heatas a function of temperature under a field cooling of 100 Oe. Our data show noanomalies associated with the temperature dependent magnetization reversal,indicating the absence of a long-rang magnetic ordering. The $ac$ magneticsusceptibility measurement points to the existence of magnetic frustration forthe Sr substituted samples exhibiting diamagnetic behavior.

Restoration of magnetization reversal under hydrostatic pressure in the lightly electron-doped manganite compound (Ca,Sr)Mn0.95Sb0.05O3