Effects Of Doping On The Magnetic Properties And Frustration Of Hexagonal Ymn(0.9)A(0.1)O(3) (A=Al, Fe, And Cu)

The doping effects on the frustration and the magnetic properties in hexagonal compounds of YMn(0.9)A(0.1)O(3) (A=Al, Fe and Cu) are investigated. Experimental results indicate that both the non- magnetic and magnetic ion dopants lead to the increase of magnetic moments and the decrease of the absolute value of Curie- Weiss temperature (vertical bar theta(CW)vertical bar). Compared with pure YMnO3, the geometrical frustration of YMn(0.9)A(0.1)O(3) is greatly suppressed and the magnetic coupling in that exhibits dopant- dependent. In addition, for the doped YMn(0.9)A(0.1)O(3), the antiferromagnetic transition temperature (T-N) is also suppressed slightly, which shows an abnormal dilution effect and it may be ascribed to the reduction of frustration due to the chemical substitution.