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arXiv · 0911.4179

Estimation of characteristic size of ferromagnetic clusters forming above T$_C$ in Nd$_{0.75}$Ba$_{0.25}$MnO$_3$ manganite

A. V. Lazuta·V. A. Ryzhov·V. V. Runov·I. O. Troyanchuk
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Abstract

We present the data on depolarization of polarized neutron beam and second harmonic of magnetization ($M_2$) for Nd$_{1-x}$Ba$_x$MnO$_3$ ($x$ = 0.23, the Curie temperature $T_C \approx$ 124 K; $x$ = 0.25, $T_C \approx$ 129 K) manganites. The depolarization starts to develop below $T$* $\approx$ 147 K $> T_C$ for both samples, being larger in x = 0.25 compound. This evidences the arising of a ferromagnetic (F) cluster phase below $T$* and a growth of its relative volume fraction with increasing doping concentration that agrees with the previously published results of $M_2$ study. A characteristic size of the F clusters and their concentration are estimated combining the neutron depolarization and $M_2$ data for $x$ = 0.25 manganite.

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A. V. Lazuta, V. A. Ryzhov, V. V. Runov, I. O. Troyanchuk. 2009-11-23. Estimation of characteristic size of ferromagnetic clusters forming above T$_C$ in Nd$_{0.75}$Ba$_{0.25}$MnO$_3$ manganite. https://arxiv.org/abs/0911.4179

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