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We investigate the ultra-sharp jump in the isothermal magnetization and theresistivity in the polycrystalline $Sm_{0.5}(Ca_{0.5-y}Sr_{y})MnO_3$ $(y = 0,0.1, 0.2, 0.25, 0.3, 0.5)$ compounds. The critical field $(H_{cr})$, requiredfor the ultra-sharp jump, decreases with increase of `Sr' concentration, i.e.with increase of average A-site ionic radius $\langle r_A\rangle$. Themagnetotransport data indicate that the phase separation increases with theincrease of $\langle r_A\rangle$, i.e. with $y$. The dependency of $H_{cr}$with magnetic field sweep rate reveals that the ultra-sharp jump fromantiferromagnetic (AFM) state to the ferromagnetic (FM) state is of martensiticin nature. Our two-band double exchange model Hamiltonian calculations showthat the `Sr' doping induces the ferromagnetic clusters in theantiferromagnetic insulating phase and in turn reduces the critical field. Inthe end we present a phenomenological picture obtained from our combinedexperimental and theoretical study.

Effect of A-site ionic radius on metamagnetic transition in charge ordered $Sm_{0.5}(Ca_{0.5-y}Sr_{y})MnO_3$ compounds