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Charge ordering phase submerged in ferromagnetic ordering phase in the Nd0.5Sr0.5MnO3 system

In this letter, Nd0.5Sr0.5Mn1- xGaxO3 (0.0⩽x⩽0.075) manganites have been investigated. Diffuse satellite spots and streaks can be seen in transmission electron microscopy and the antiferromagnetic signal in electron spin resonance also occur early at 235 K which is much higher than the usually defined TCO of the Nd0.5Sr0.5Mn1- xGaxO3 sample, indicating that the charge ordering phase already appears in the ferromagnetic regions (TC=250 K). This charge ordering phase is submerged by the ferromagnetic phase so that it is invisible in routine measurements. As the TC moves to lower temperature with Ga doping, the charge ordering phase exhibits itself gradually around 240 K.