Spin glassy behavior and large exchange bias effect in cubic perovskite Ba0.8Sr0.2FeO3-δ

Spin glassy behavior and large exchange bias effect in cubic perovskite Ba_0.8Sr_0.2FeO_3-δ

Liu Yu-Xuan^{1, 2}, Liu Zhe-Hong^{2, 3}, Ye Xu-Bin^{2, 3}, Shen Xu-Dong^{2, 3}, Wang Xiao^{2, 3}, Zhou Bo-Wen^{2, 3}, Zhou Guang-Hui^{1, †}, Long You-Wen^{2, 4, ‡}

(a) Plots of temperature dependence of DC magnetic susceptibility measured at 0.1 T. The inset shows plots of magnetization versus magnetic field, measured at different temperatures for Ba_0.8Sr_0.2FeO^2.81. (b) Temperature dependence of specific heat, measured between 2 and 100 K. Inset shows fitting result (red curve) using function C p = β T 3 / 2 + α T 3 . (c) Temperature dependence of resistivity. Inset shows fitting result (red line) using hopping model of small polarons as described in the text.