Inhomogeneous magnetism in La-doped CaMnO3. (I) Nanometric-scale spin clusters and long-range spin canting

Abstract

Neutron measurements on Ca{1-x}La{x}MnO3 (0.00 <= x <= 0.20) reveal the development of a liquid-like spatial distribution of magnetic droplets of average size ~10 Angstroms, the concentration of which is proportional to x (one cluster per ~60 doped electrons). In addition, a long-range ordered ferromagnetic component is observed for ~0.05 < x < ~0.14. This component is perpendicularly coupled to the simple G-type antiferromagnetic (G-AFM) structure of the undoped compound, which is a signature of a G-AFM + FM spin-canted state. The possible relationship between cluster formation and the stabilization of a long-range spin-canting for intermediate doping is discussed.

arXiv commentSubmitted to Physical Review B

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• Impurity Conduction and Magnetic Polarons in Antiferromagnetic Oxides
• Effect of pressure on the magnetic, transport, and thermal-transport properties of the electron-doped manganite CaMn${}_{1-x}$Sb${}_x$O${}_3$
• Polaron Transport in the Paramagnetic Phase of Electron-Doped Manganites
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