Abstract
We report the inhomogeneous magnetic state with the characteristics of spin-glass like behavior in KFeO2 from the low temperature magnetization and magnetization relaxation of zero field cooled measurements. The results reveal a possible spin glass state below the typical glass transition temperature (Tg). The low temperature isothermal hysteresis loops reveal a spin configuration consisting of a small ferromagnetic component within an antiferromagnetic ground state. The observation of spin-glass state in KFeO2 may be attribute to the competition between ferromagnetic and antiferromagnetic component. And the ferromagnetic component might origin from the frustration effect or nonstoichiometric caused mixed valence state of Fe ions in KFeO2. Hence, we expect that a similar phenomenon would exist in related AFeO2 (A: alkali metal) family with strong super-exchange interactions.
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