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The magnetic phase diagram has been mapped out via the measurements ofelectronic resistivity, magnetization and specific heat in the cobalt-basedlayered LnCo1-xFexAsO (Ln=La, Sm) compounds. The ferromagnetic (FM) transitionat 63 K for LaCoAsO is rapidly suppressed upon Fe doping, and ultimatelydisappears around x=0.3 in the LaCo1-xFexAsO system. When La is replaced bymagnetic rare earth element Sm, the 3d electrons first undergo a FM transitionat Tc = 75 K, followed by an antiferromagnetic (AFM) transition at a lowertemperature TN1 = 45 K. With partial Fe doping on the Co site, both FM (Tc) andAFM (TN1) transition temperatures are significantly suppressed, and finallyapproach zero kelvin at x = 0.3 and 0.2, respectively. Meanwhile, a thirdmagnetic transition at TN2 = 5.6 K for SmCoAsO, associated with the AFM orderof the Sm3+ 4f-oments, is uncovered and TN2 is found to be almost robustagainst the small Fe-doping. These results suggest that the 4f electrons ofSm3+ have an important effect on the magnetic behavior of 3d electrons in the1111 type Co-based LnCo1-xFexAsO systems. In contrast, the magnetism of thef-electrons is relatively unaffected by the variation of the 3d electrons. Therich magnetic phase diagram in the Co-rich side of the LnCo1-xFexAsO system,therefore, is established.

Magnetic phase diagram in the Co-rich side of LnCo1-xFexAsO (Ln=La, Sm) system