Spin dependence of the magnetization step in the Pr-doped manganites

Magnetic measurements were performed to study a single crystal Pr0.5Sr0.5MnO3 and polycrystalline Pr0.6Ca0.4MnO3. Magnetic-field-induced magnetization step is observed at low temperature for Pr-doped phase-separated manganites. Magnetization measurements indicate that the spin-stiffness constant D exhibits large magnetic-field dependence. Moreover, there exists a remarkable change of the spin-stiffness constant corresponding to the variety of the step-like magnetization. Our results suggest that the spin-wave inherent to the coexistence of the antiferromagnetic and ferromagnetic phases plays a crucial role in the mechanism of these magnetic transformations. Copyright (C) EPLA, 2008.