Ru-doping-induced ferromagnetism in charge-ordered La_0.4Ca_0.6MnO₃

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C. L. Lu, X. Chen, S. Dong, K. F. Wang, H. L. Cai, and J.-M. Liu
Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China and International Center for Materials Physics, Chinese Academy of Science, Shenyang 110016, China

D. Li and Z. D. Zhang
Shenyang National Laboratory for Material Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received 24 February 2009; revised 2 May 2009; published 4 June 2009

Impurityeffects on the stability of a charge-ordered antiferromagnetic state inelectron-doped manganite La_0.4Ca_0.6MnO₃ are investigated by doping Ru for Mn.Our results show that Ru doping at a tiny levelof ~2% is sufficient to suppress significantly the charge-ordered insulatedstate and generate a ferromagnetic metallic one. The blocked metastablestate and the first-order metal-insulator transitions observed in the slightlydoped samples can be attributed to the phase-separated state whereferromagnetic domains are embedded in the charge-ordered matrix. The dopingeffect is further investigated theoretically based on the two-orbital model.The calculation suggests that two factors are vitally important forthe Ru-doping driven strong ferromagnetic tendency: (1) the ferromagnetic couplingbetween Ru and Mn spins and (2) the enhancement ofe_g electron density while the topological defects always contribute tothe instability of charge-ordered state.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.79.245105
DOI:	10.1103/PhysRevB.79.245105
PACS:	75.47.Lx; 75.47.Gk; 71.30.+h 75.47.Lx Magnetotransport phenomena in manganites 75.47.Gk Colossal magnetoresistance 71.30.+h Metal-insulator transitions and other electronic transitions YEAR: 2009
KEYWORDS:	antiferromagnetism, calcium compounds, colossal magnetoresistance, electron density, ferromagnetism, lanthanum compounds, magnetisation, manganese compounds, metal-insulator transition

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