Magnetic, Electronic Transport, and Calorimetric Investigations of La_1-xCa_xCoO_3 in Comparison with La_1-xSr_xCoO_3(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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The magnetic and electronic transport properties and the specific heat of La_1-xCa_xCoO_3(0.05 ≦ x ≦ 0.5) have been investigated. In the whole composition range, the Co atoms are in an intermediate-spin (IS) state, and a spin glass or a ferromagnetic ordered state appears at low temperatures. The conductivity increases with x, and shows a metallic temperature dependence for x ≧ 0.4. The overall resemblance of the Ca substituted system with the Sr substituted one implies that the Ca substitution introduces holes into Co-O bonds as in the case of the Sr substitution. The present results reveal that the hole-doping, not the ionic size, is essential to stabilize the IS state of Co atoms in La_1-xM_xCoO_3 with M being a divalent ion. The quantitative difference, lower T_C and less conductivity for M = Ca than M = Sr with the same x, suggests less mobility and/or less number of holes in the system with M = Ca. The electronic specific heat coefficient, null for LaCoO_3, increases sharply around x = 0.2 for M = Sr and x = 0.25 for M = Ca, and saturates at higher concentrations. The observation indicates the presence of the Fermi surface in the deeply substituted specimens. The magneto-transport properties of the metallic specimens, especially a large amplitude of the side-jump scattering in the extraordinary Hall resistivity, are characteristic of itinerant ferromagnetic metals, which supports the double exchange mechanism in the present system.
- 社団法人日本物理学会の論文
- 2002-11-15
著者
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KOBAYASHI Yoshihiko
Department of Applied Physics and Chemistry, The University of Electro-Communications
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ASAI Kichizo
Department of Applied Physics and Chemistry, The University of Electro-Communications
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Asai Kichizo
Department Of Applied Physics And Chemistry The University Of Electro-communications
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MUTA Kenjiro
Department of Applied Physics and Chemistry, The University of Electro-Communications
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Muta Kenjiro
Department Of Applied Physics And Chemistry The University Of Electro-communications:(present Addres
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Kobayashi Yoshihiko
Department Of Applied Physics And Chemistry The University Of Electro-communications
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