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Formation of an antiferromagnetic metal phase in the electron-doped Sr$_{0.98}$La$_{0.02}$MnO$_3$ oxide according to $^{17}$O NMR data

Z. N. Volkova^a, S. V. Verkhovskii^a, A. P. Gerashchenko^a, A. Yu. Germov^a, K. N. Mikhalev^a, A. Yu. Yakubovskii^b, E. I. Konsatntinova^c, I. A. Leonidov<sup>c

a</sup> Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
^b National Research Center Kurchatov Institute, Moscow, Russia
^c Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia

Abstract: The spin density distribution of itinerant electrons, $n_{eg}$, and their effect on pairwise correlations of localized spins $S(t_{2g})$ of Mn$^{4+}$ ions in cubic Sr$_{1-x}$La$_x$MnO$_3$ antiferromagnet ($x = 0.02$, $T_{\mathrm{N}} = 230$ K, $\mathrm{G}$ type magnetic structure) is studied experimentally by nuclear magnetic resonance on $^{17}$O nuclei. The regions with $n_{eg}>x$, in which the local spin susceptibility of pairs of Mn atoms follows the dependence $\chi\sim(T-\Theta)^{-1}$ with $\Theta = 20(5)$ K, indicating the growth of ferromagnetic spin correlations of neighboring magnetic ions in these domains, are found in the paramagnetic phase. The fraction of Mn-O-Mn bonds ($n_{eg}>x$) increases with the decrease in the temperature. The interpenetrating meshes of Mn-O-Mn bonds with different densities of itinerant $e_g$ electrons form an antiferromagnetic metal phase below $T_{\mathrm{N}}$. The role of weak localization effects is discussed as the main origin of the magnetic inhomogeneity of the antiferromagnetic metal phase in Sr$_{0.98}$La$_{0.02}$MnO$_3$.

Received: 10.01.2019
Revised: 05.03.2019
Accepted: 07.03.2019

DOI: 10.1134/S0370274X19080113

 English version: Journal of Experimental and Theoretical Physics Letters, 2019, 109:8, 541–545

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