Abstract
The effect of a small amount of substitution on magnetic ordering in a frustrated triangular lattice antiferromagnet CuFeO 2 has been studied by neutron diffraction, magnetic susceptibility and specific heat measurements on CuFe 1- x Al x O 2 single-crystals with x =0.02 and x =0.05. With only a small amount of substitution, x =0.02, the zero-field successive magnetic phase transitions with quasi-Ising character observed for x =0.00 are entirely changed to successive phase transitions from a paramagnetic state to an incommensurate complex state through an incommensurate magnetic state, suggesting that the original Heisenberg spin character hidden in CuFeO 2 is retrieved.
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