Spin dependence of the magnetization step in the Pr-doped manganitesGuixin Cao, Jincang Zhang, Baojuan Kang, Yanna Sha, Shixun Cao and Xuechu Shen
Department of Physics, Shanghai University - Shanghai 200444, China
received 28 June 2007; accepted in final form 26 October 2007; published January 2008
published online 19 November 2007
Magnetic measurements were performed to study a single crystal Pr0.5Sr0.5MnO3 and polycrystalline Pr0.6Ca0.4MnO3. Magnetic-fieldinduced 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.
71.30.+h - Metal-insulator transitions and other electronic transitions.
75.30.Kz - Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.).
71.27.+a - Strongly correlated electron systems; heavy fermions.
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