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The magnetic glassy state is a fascinating phenomenon, which results from thekinetic arrest of the first order magnetic phase transition. Interestingproperties, such as metastable magnetization and nonequilibrium magneticphases, are naturally developed in the magnetic glassy state. Here, we reportmagnetic glass property in the low spin state of Co3+ in EuBaCo2O5+{\delta}({\delta} = 0.47) cobaltite at low temperature (T < 60 K). The measurements ofmagnetization under the cooling and heating in unequal fields, magnetizationrelaxation and thermal cycling of magnetization show the kinetic arrest of lowmagnetization state below 60 K. The kinetically arrested low temperaturemagnetic phase is further supported through the study of isothermal magneticentropy, which shows the significant entropy change. The present results willopen a new window to search the microscopic relation between the spin statetransitions and the kinetic arrest induced magnetic glassy phenomena in complexmaterials.

Magnetic glassy state at low spin state of Co3+ in EuBaCo2O5+{\delta} ({\delta} = 0.47) cobaltite