Ru doping of the Mn site in La0.4Ca0.6MnO3 perovskite: Electron magnetic resonance study of electronic and magnetic ordering

Alexander Shames, Evgeny Rosenberg, Mark Auslender, Gad Gorodetsky, A. Yakubovsky, S. Gudenko, C. Martin, A. Maignan

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Abstract

X -band (μ=9.4 GHz) electron magnetic resonance (EMR) measurements were carried out in polycrystalline La0.4 Ca0.6 Mn1-x Rux O3 (0≤x≤0.16) samples at 100 K≤T≤550 K, aiming to study magnetic/electronic ordering induced by Ru doping. EMR indicates that such doping modifies even the paramagnetic state of La0.4 Ca0.6 Mn1-x Rux O3 series: the linewidth of resonance signal increases with doping. The initial charge-ordered (CO) antiferromagnetic (AFM) ground state is also drastically modified by doping. At Ru contents x≥0.04, the ferromagnetic (FM) EMR signal is observed below former TCO. It evidences that the CO transition transforms into the FM one. The magnetic ground state of La0.4 Ca0.6 Mn1-x Rux O3 remains definitely inhomogeneous due to the coexistence of FM and AFM phases up to, at least, x=0.10. The data obtained are compared with known ones for Ca Mn1-x Rux O3 system and discussed in the framework of the energy diagram model for Ru-doped manganites.

Original languageEnglish
Article number08Q304
JournalJournal of Applied Physics
Volume99
Issue number8
DOIs
StatePublished - 25 May 2006
Externally publishedYes

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