Magneto-Electronic Phase Separation in La_0.7Sr_0.3MnO₃ with Metallic Behavior in Paramagnetic Region

Abstract:

The data on transport and magnetic properties (ac linear and nonlinear (second and third orders) susceptibilities) are presented for La_0.7Sr_0.3MnO₃ single crystal with metallic behavior in paramagnetic (PM) region and ferromagnetic (FM) metallic ground state. The FM clusters originate in the PM matrix of the compound below some temperature T* > 425 K, their nonlinear response being weakly T-dependent down to 367 K. This was attributed to clusters arising in the preferable sites formed by chemical inhomogeneities introduced by doping. On cooling below T^# ≈ 366 K > T_C ≈ 363.3 K, a fast growth of cluster response without the change of its parameters is observed that was attributed to the development of homogeneous nucleation of the FM clusters. The latter stage continues below T_C and is accompanied by a crossover to the steeper decreasing of resistivity with cooling that suggests metallic properties of the clusters. The cluster nonlinear response masks completely that of matrix at T = 360.3 K < T_C, where it is well described by the model of ensemble of magnetic single-domain nanoparticles in superparamagnetic regime based on the formalism involving Gilbert-Landau-Lifshits equation. Below T_D = 359.6 K at the stage of domain formation, a weak interaction of matrix and cluster subsystems leads to their mutual ordering, which is accompanied by a sharp decrease of the nonlinear response to a weak ac field in small steady field H. The latter suggests an “antiferromagnetic” type of arrangement of these subsystems that provides decreasing the magnetostatic energy of the sample.

• Periodical: Solid State Phenomena (Volumes 233-234)
• Pages: 117-120
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.233-234.117
• Online since: July 2015
• Authors: V.A. Ryzhov*, Vladimir P. Khavronin, Vladimir V. Deriglazov, Yakov M. Mukovskii, Vladimir I. Chichkov
• Keywords: AC Susceptibility, Doped Manganites, Magnetic Phase Transitions, Magneto-Electronic Phase Separation, Nonlinear Response to a Weak Ac Field

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