Electron- and Hole-Doping Effects on A-Site Ordered NdBaMn sub( 2)O sub( 6)

We have investigated electron- and hole-doping effects on A-site ordered perovskite manganite NdBaMn2O6, which has the A-type (layered) antiferromagnetic (AFM) ground state. Electrons (holes) are introduced by partial substitution of Ba 2+ (Nd 3+) with Nd 3+ (Ba 2+). Electron-doping generates ferromagnetic (FM) clusters in the A-type AFM matrix. With increasing the electron-doping level, the volume fraction of the FM phase or the number of the FM clusters is abruptly increasing. In contrast, the A-type AFM phase is robust against the hole-doping, and no FM correlation is observed in the hole-doped NdBaMn2O6.