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| - Magnetic phase transition and the spin excitations in cluster antiferromagnetic K 0.8Fe 1.6Se 2
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| - We have studied the magnetic phase diagram and magnetic properties of iron selenide K 0.8Fe 1.6Se 2 using an effective spin-exchange model. By applying the bond-operator approach, we show that the Fe moments form a checkerboard antiferromagnetic structure in a wide range of parameter regions, and the phase boundary between the magnetic phase and the spin-disordered phase is calculated as a function of the exchange interactions. We also calculate the spin excitation spectrums as well as the predicted inelastic neutron scattering patterns of the checkerboard antiferromagnetic state within the spin-wave method.
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