Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Electrical Transport and Magnetoresistance of La0.67Ca0.33MnO3: Agx (x = 0, 0.1, 0.2, 0.3, 0.4) Composites

  • Gencer, H. (Department of Physics, Science and Arts Faculty, Inonu University) ;
  • Pektas, M. (Department of Physics, Science and Arts Faculty, Inonu University) ;
  • Babur, Y. (Department of Physics, Science and Arts Faculty, Harran University) ;
  • Kolat, V.S. (Department of Physics, Science and Arts Faculty, Inonu University) ;
  • Izgi, T. (Department of Physics, Science and Arts Faculty, Inonu University) ;
  • Atalay, S. (Department of Physics, Science and Arts Faculty, Inonu University)
  • Received : 2012.05.03
  • Accepted : 2012.07.30
  • Published : 2012.09.30
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Abstract

The structural, magnetic and magnetotransport properties of $La_{0.67}Ca_{0.33}MnO_3$: $Ag_x$ (x = 0, 0.1, 0.2, 0.3 and 0.4) composites were investigated systematically. X-ray and EDX analysis indicated that Ag is not substituted into the main $La_{0.67}Ca_{0.33}MnO_3$ phase and remains an additive to the second phase at the grain boundary. The Curie temperature first decreased from 269 K for x = 0 to 257 K for x = 0.1 and then remained nearly unchanged with increasing Ag content. For the x > 0.1 samples, a second transition temperature ($T_{MI2}$) was observed in the resistance curves. At temperatures below 150 K, a significant enhancement in MR was observed while high temperature MR decreased with increasing Ag content. The maximum MR was observed to be 55% in the x = 0.4 sample at 10 K and a 6T magnetic field, this value is larger than that of pure $La_{0.67}Ca_{0.33}MnO_3$ (53% at 265 K and 6 T). In addition, at low fields (H < 1T), a sharp increase in the MR was observed.

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References

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