Evidence of anisotropic magnetic polarons in La 0.94 Sr 0.06 MnO 3 by neutron scattering and comparison with Ca-doped manganites
Marie-Claire Hennion,F. Moussa,G. Biotteau,Juan Rodríguez-Carvajal,L. Pinsard,A. Revcolevschi +5 more
TLDR
In this paper, elastic small q scattering exhibits a modulation with an anisotropic q dependence, which closely reflects the ferromagnetic correlations found for the static clusters, although some characteristics of a canted state are also observed suggesting a weakly inhomogeneous state.Abstract:
Elastic and inelastic neutron-scattering experiments have been performed in a ${\mathrm{La}}_{0.94}{\mathrm{Sr}}_{0.06}{\mathrm{MnO}}_{3}$ untwinned crystal, which exhibits an antiferromagnetic canted magnetic structure with ferromagnetic layers. The elastic small q scattering exhibits a modulation with an anisotropic q dependence. It can be pictured by ferromagnetic inhomogeneities or large magnetic polarons with a platelike shape, the largest size $(\ensuremath{\approx}17 \AA{})$ and largest interpolaron distance $(\ensuremath{\approx}38 \AA{})$ being within the ferromagnetic layers. Comparison with observations performed on Ca-doped samples, which show the growth of the magnetic polarons with doping, suggests that this growth is faster for the Sr than for the Ca substitution. Below the gap of the spin-wave branch typical of the antiferromagnetic layered magnetic structure, an additional spin-wave branch reveals a ferromagnetic and isotropic coupling, already found in Ca-doped samples. Its q-dependent intensity, very anisotropic, closely reflects the ferromagnetic correlations found for the static clusters. All these results agree with a two-phase electronic segregation occurring on a very small scale, although some characteristics of a canted state are also observed suggesting a weakly inhomogeneous state.read more
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Colossal-magnetoresistance materials: manganites and conventional ferromagnetic semiconductors
TL;DR: In this article, experimental data and their theoretical interpretation are presented for the colossal magnetoresistance (CMR) materials to which conventional ferromagnetic semiconductors and manganites belong.
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Exchange bias effect in alloys and compounds
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TL;DR: In this paper, the authors present a detailed magnetic study of the manganite, where they observe the presence of small ferromagnetic (FM) domains (diameter $\ensuremath{\sim}10\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$) immersed within the charge-ordered antiferromagnetic host.
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Structural and magnetic phase diagrams of La 1-x Sr x MnO 3 and Pr 1-y Sr y MnO 3
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TL;DR: In this article, the magnetic and nuclear structures and properties of the nuclear and magnetic structures were investigated using neutron powder diffraction, resistivity and magnetic measurements, and the full magnetic and structural phase diagram was presented.
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Inhomogeneous magnetism in La-doped CaMnO 3 . I. Mesoscopic phase separation due to lattice-coupled ferromagnetic interactions
Chris D. Ling,Eduardo Granado,Eduardo Granado,John J. Neumeier,Jeffrey W. Lynn,Jeffrey W. Lynn,Dimitri N. Argyriou +6 more
TL;DR: In this paper, a detailed investigation of mesoscopic magnetic and crystallographic phase separation in polycrystalline samples is presented, and it is argued that the presence of multiple low-temperature magnetic and crystalographic phases is an intrinsic feature of the system that follows from the shifting balance between competing ferromagnetic and antiferromagnetic interactions as a function of temperature.
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