2005/10/13 by E. A. Neifeld, É. A. Neĭfeld, Neifeld, E. A. +9
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #FOS: Physical sciences #High-pressure geophysics and materials #Magnetic and transport properties of perovskites and related materials #Rare-earth and actinide compounds #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0510362
7 pages; 4 figures
arxiv created 2005/10/13 · openalex publication_date 2005/10/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The experimental results of studying the resistivity and magnetic susceptibility are presented for the single crystal La(1-x)Sr(x)MnO(3) (x=0.15;0.175) and CaMnO(3-d). We revealed the temperature dependence of the magnetic component of activation energy of hopping conductivity (Em) in paramagnetic phase: Em=Em0(+ or -)a/T, where the "+" sign corresponds to antiferromagnetic manganite CaMnO(3-d), and the "-" sign to ferromagnetic manganites La(1-x)Sr(x)MnO(3). It has been shown that for antiferromagnetic that temperature dependence of activation energy has a maximum coinciding with a maximum of magnetic susceptibility. For ferromagnetic sample La(0.85)Sr(0.15)MnO(3) the minimum of activation energy and maximum of magnetic susceptibility also coincide. The results obtained are explained on the basic of the model proposed in Gor'kov's works.