• Title/Summary/Keyword: Colossal Magnetroresistance(CMR)

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Magnetic and Electrical Properties of Ln0.7Ca0.3MnO3 (Ln = Nd, Sm, La) (Ln0.7Ca0.3MnO3(Ln = Nd, Sm, La)의 자기적 전기적 특성)

  • Chon, Gom-Bai;Im, Hung-Su;Lee, Chan-Gyu;Koo, Bon-Heun;Lee, Sang-Min;Jung, Myung-Hwa;Jo, Young-Hun
    • Korean Journal of Materials Research
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    • v.17 no.4
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    • pp.203-206
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    • 2007
  • Effects of doping rare earth elements on Ln site of $Ln_{0.7}Ca_{0.3}MnO_3$ (Ln = N d, Sm and La) were examined from structure, magnetic and electrical properties. Size of a-axis increased as following order of La < Nd < Sm, whereas c-axis was not much changed. Curie temperatures of 170 K for $Nd_{0.7}Ca_{0.3}MnO_3$, 110 K for $Sm_{0.7}Ca_{0.3}MnO_3$ and 250 K for $La_{0.7}Ca_{0.3}MnO_3$ were obtained. This result coincides with change of Mn-O bond length causing by a-axis lattice constant. The highest magnetroresistance ratios were 22% at 77 K for $Sm_{0.7}Ca_{0.3}MnO_3$, 32% at 110 K for $Nd_{0.7}Ca_{0.3}MnO_3$, and 33% at 180 K for $La_{0.7}Ca_{0.3}MnO_3$.

Sintering behavior and characterization of Ln0.7Ca0.3MnO3 (Ln=Nd, Sm, La) (Ln0.7Ca0.3MnO3 (Ln=Nd, Sm, La)의 소결 거동 및 특성)

  • Chon, Gom-Bai;Koo, Bon-Heun;Lee, Chan-Gyu
    • Korean Journal of Materials Research
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    • v.16 no.1
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    • pp.44-49
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    • 2006
  • Effects of doping rare earth element on Ln site of $Ln_{0.7}Ca_{0.3}MnO_3$ (Ln=Nd, Sm and La) were examined from sintering behavior, structure and magnetic properties. Sintering reactions proceeded rapidly in order of $La_{0.7}Ca_{0.3}MnO_3>Nd_{0.7}Ca_{0.3}MnO_3>Sm_{0.7}Ca_{0.3}MnO_3$. This result can be explained by diffusivity of metal cation. Size of a-axis increased as following order of La$Nd_{0.7}Ca_{0.3}MnO_3$, 93K for $Sm_{0.7}Ca_{0.3}MnO_3$ and 225K for $La_{0.7}Ca_{0.3}MnO_3$ were obtained. This result coincides with change of Mn-O bond length causing by a-axis lattice constant.