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

paper

Estimation of characteristic size of ferromagnetic clusters forming above T $_{C}$ in Nd $_{0.75}$ Ba $_{0.25}$ MnO $_{3}$ manganite

arXiv:0911.4179

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.

8 pages, 2 figures

Estimation of characteristic size of ferromagnetic clusters forming above TC​ in Nd0.75​Ba0.25​MnO3​ manganite

Abstract

Estimation of characteristic size of ferromagnetic clusters forming above T $_{C}$ in Nd $_{0.75}$ Ba $_{0.25}$ MnO $_{3}$ manganite