Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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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 (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Im, Hung-Su (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Lee, Chan-Gyu (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Koo, Bon-Heun (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Lee, Sang-Min (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Jung, Myung-Hwa (Material Research Team, Korea Basic Science Institute) ;
  • Jo, Young-Hun (Material Research Team, Korea Basic Science Institute)
  • 전검배 (창원대학교 나노.신소재공학부) ;
  • 임흥수 (창원대학교 나노.신소재공학부) ;
  • 이찬규 (창원대학교 나노.신소재공학부) ;
  • 구본흔 (창원대학교 나노.신소재공학부) ;
  • 이상민 (창원대학교 나노.신소재공학부) ;
  • 정명화 (한국기초과학연구원 양자물성팀) ;
  • 조영훈 (한국기초과학연구원 양자물성팀)
  • Published : 2007.04.27
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Abstract

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 $La_{0.7}Ca_{0.3}MnO_3$.

Keywords

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