Electron paramagnetic resonance study of size and nonstoichiometry effects on magnetic ordering in half-doped La0.5 Ca0.5 MnO3 manganite

Mark Auslender; Alexander Shames; Evgeny Rosenberg; E. Sominski; A. Gedanken; Ya M. Mukovskii

doi:10.1063/1.3335949

Electron paramagnetic resonance study of size and nonstoichiometry effects on magnetic ordering in half-doped La0.5 Ca0.5 MnO₃ manganite

Mark Auslender, Alexander Shames, Evgeny Rosenberg, E. Sominski, A. Gedanken, Ya M. Mukovskii

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

The X -band electron paramagnetic resonance in La0.5 Ca0.5 MnO₃ was studied. Fitting the measured temperature dependence of the EPR linewidth and intensity to established models were employed to probe the effects of finite-size and nonstoichiometry. Regarding these effects, the complex mixed magnetic ordering inherent in bulk samples was shown to be unstable. The antiferromagnetic (AFM) and charge ordered component is suppressed in nanosamples. But the ferromagnetic (FM) state, appearing in nanograins, is frustrated due to (i) an AFM-like core-shell interaction and (ii) a strong spin disorder at the surfaces and core-shell transition layers. In addition, a weak nonstoichiometry which does not affect the crystal structure in bulk induces a strong decrease of the FM component in its magnetic ground state.

Original language	English
Article number	09D702
Journal	Journal of Applied Physics
Volume	107
Issue number	9
DOIs	https://doi.org/10.1063/1.3335949
State	Published - 1 May 2010
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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abstract = "The X -band electron paramagnetic resonance in La0.5 Ca0.5 MnO3 was studied. Fitting the measured temperature dependence of the EPR linewidth and intensity to established models were employed to probe the effects of finite-size and nonstoichiometry. Regarding these effects, the complex mixed magnetic ordering inherent in bulk samples was shown to be unstable. The antiferromagnetic (AFM) and charge ordered component is suppressed in nanosamples. But the ferromagnetic (FM) state, appearing in nanograins, is frustrated due to (i) an AFM-like core-shell interaction and (ii) a strong spin disorder at the surfaces and core-shell transition layers. In addition, a weak nonstoichiometry which does not affect the crystal structure in bulk induces a strong decrease of the FM component in its magnetic ground state.",

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AU - Auslender, Mark

AU - Shames, Alexander

AU - Rosenberg, Evgeny

AU - Sominski, E.

AU - Gedanken, A.

AU - Mukovskii, Ya M.

PY - 2010/5/1

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N2 - The X -band electron paramagnetic resonance in La0.5 Ca0.5 MnO3 was studied. Fitting the measured temperature dependence of the EPR linewidth and intensity to established models were employed to probe the effects of finite-size and nonstoichiometry. Regarding these effects, the complex mixed magnetic ordering inherent in bulk samples was shown to be unstable. The antiferromagnetic (AFM) and charge ordered component is suppressed in nanosamples. But the ferromagnetic (FM) state, appearing in nanograins, is frustrated due to (i) an AFM-like core-shell interaction and (ii) a strong spin disorder at the surfaces and core-shell transition layers. In addition, a weak nonstoichiometry which does not affect the crystal structure in bulk induces a strong decrease of the FM component in its magnetic ground state.

AB - The X -band electron paramagnetic resonance in La0.5 Ca0.5 MnO3 was studied. Fitting the measured temperature dependence of the EPR linewidth and intensity to established models were employed to probe the effects of finite-size and nonstoichiometry. Regarding these effects, the complex mixed magnetic ordering inherent in bulk samples was shown to be unstable. The antiferromagnetic (AFM) and charge ordered component is suppressed in nanosamples. But the ferromagnetic (FM) state, appearing in nanograins, is frustrated due to (i) an AFM-like core-shell interaction and (ii) a strong spin disorder at the surfaces and core-shell transition layers. In addition, a weak nonstoichiometry which does not affect the crystal structure in bulk induces a strong decrease of the FM component in its magnetic ground state.

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Electron paramagnetic resonance study of size and nonstoichiometry effects on magnetic ordering in half-doped La0.5 Ca0.5 MnO₃ manganite

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