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We have investigated the Mn-site substitution effect inNd$_{0.45}$Sr$_{0.55}$MnO$_3$ single crystal, which has an $A$-type layeredantiferromagnetic ($A$-AFM) phase with the 3$d_{x^2-y^2}$-type orbital-order.Substitution of Fe or Ga for Mn-site suppresses both the $A$-AFM order andcompeting ferromagnetic (FM) correlation whereas Cr substitution suppressesonly the $A$-AFM order but reactivates the underlying FM correlation viadouble-exchange mechanism along the AFM coupled $c$-direction. InNd$_{0.45}$Sr$_{0.55}$Mn$_{0.95}$Cr$_{0.05}$O$_3$, the $A$-AFM state with theorbital-order is changed into the orbital-disordered three-dimensional FMmetallic state by applying magnetic field of $\mu_0 H = 12$ T, which is muchsmaller than that of the parent compound Nd$_{0.45}$Sr$_{0.55}$MnO$_3$.

Reduction of critical field for magnetic and orbital-ordering phase transition in impurity-substituted Nd$_{0.45}$Sr$_{0.55}$MnO$_3$ crystal