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Low-temperature electronic states in SrRu_{1-x}Mn_xO_3 for x <= 0.6 have beeninvestigated by means of specific-heat C_p measurements. We have found that ajump anomaly observed in C_p at the ferromagnetic (FM) transition temperaturefor SrRuO_3 changes into a broad peak by only 5% substitution of Mn for Ru.With further doping Mn, the low-temperature electronic specific-heatcoefficient gamma is markedly reduced from the value at x=0 (33 mJ/K^2 mol), inconnection with the suppression of the FM phase as well as the enhancement ofthe resistivity. For x >= 0.4, gamma approaches to ~ 5 mJ/K^2 mol or less,where the antiferromagnetic order with an insulating feature in resistivity isgenerated. We suggest from these results that both disorder and reconstructionof the electronic states induced by doping Mn are coupled with the magneticground states and transport properties.

Specific-heat study for ferromagnetic and antiferromagnetic phases in SrRu_{1-x}Mn_xO3