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Effect of Cu doping at the Mn site on the transport aaand magnetic behaviors of La 2/3 Ca 1/3 MnO 3

Author

Listed:
  • S.L. Yuan
  • Z.Y. Li
  • X.Y. Zeng
  • G.Q. Zhang
  • F. Tu
  • G. Peng
  • J. Liu
  • Y. Jiang
  • Y.P. Yang
  • C.Q. Tang

Abstract

We show that the replacement of Mn with Cu, without any structure change, strongly affects the transport and magnetic behaviors in La 2/3 Ca 1/3 Mn1-xCuxO 3 - δ (x ?0.3). Doping largely shifts the insulator-metal transition towards the low-temperature regime and causes substantial enhancements in both resistance and magnetoresistance near the transition for doping range of x ? 15%, and further doping to x ≥ 20% shows insulating behavior. For 15% doping, the sample shows large magnetoresistances (∼104%) over the whole low temperature range. Magnetization measurement at helium temperature reveals that samples for x ? 10% and ≥ 20% basically show ferromagnetic (FM) and antiferromagnetic (AF) behaviors, respectively, while the 15% Cu doped sample undergoes a metamagnetic transition from AF state to FM state on increasing field. We argue that doping introduces the AF insulating phase into the system, causing unusual transport and magnetic behaviors.
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Suggested Citation

  • S.L. Yuan & Z.Y. Li & X.Y. Zeng & G.Q. Zhang & F. Tu & G. Peng & J. Liu & Y. Jiang & Y.P. Yang & C.Q. Tang, 2001. "Effect of Cu doping at the Mn site on the transport aaand magnetic behaviors of La 2/3 Ca 1/3 MnO 3," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 20(2), pages 177-181, March.
    • Handle: RePEc:spr:eurphb:v:20:y:2001:i:2:p:177-181
    DOI: 10.1007/BF01315688
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