Abstract
The effect of Cr-doping on the Mn site in the perovskite Nd 0.45Sr 0.55MnO 3 has been studied by using the magnetization, magnetoresistance, thermal expansion and magnetostriction measurements. Mother material changes from paramagnetic semiconducting state (PMS) to antiferromagnetic metallic one (AFM) at T N( M) =230 K . 5 at% Cr-doped material changes from PMS to ferromagnetic metallic state (FMM) at T C =250 K and then to antiferromagnetic insulating one (AFMI) at T N( I) =140 K . Either the application of 7 T magnetic field or additional 5 at% Cr-doping on this material completely suppresses the AFMI keeping the FMM down to the lowest temperature (10 K) measured. Observed characteristic anomalies near T N( M) , T C and T N(I) indicate strong correlation between d-electron e g state and lattice state.
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