The critical behavior of La0.75Ca0.05Na0.20MnO3 was studied at around room temperature via magnetization measurements. From the relative slope, we deduced that the Tricritical Mean-Field model was the most suitable model. The estimated critical exponents were found to be beta = 0.24 +/- 0.004, gamma = 0.98 +/- 0.065 and delta = 5.08 at T-C = 300 K. These critical exponents satisfied the Widom scaling relation gamma = 1 + gamma/beta, implying the reliability of our values. Based on the critical exponents, the magnetization-field-temperature (M-mu H-0-T) data around T-C collapsed into two curves, obeying the single scaling equation M(H, epsilon) = epsilon(beta)f(+/-)(H/epsilon(beta+gamma)) with epsilon = (T - TC)/TC being the reduced temperature. These results suggest short-range interaction in our sample.
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