Abstract
We present here investigations on a hole doped layered perovskite, La1.2Sr0.8CoO4. In these systems concentration of the holes in host matrix decides ratio of the Co2+/Co3+ and magnetic phase diagram. In addition, spin-state of the Co3+ ions has an important role in magnetic correlations. Magnetization measurements show the signature of some exotic phases like cluster glass or canonical spin-glass and ferromagnetic ordering (Tc ∼ 211 K). In addition, calculated temperature variation of order parameter by also including the spin-state variations of Co3+ manifests that the orbital magnetic moments are not quenched here and has an important role in overall magnetic moment at low temperatures.
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