DC and AC transport properties on La₀.₈Sr₀.₂MnO₃

Magnetoresistive sensor can be widely used in modern transportation field, such as the vehicle positioning and navigation system, vehicle detection system, and intelligent transportation system. In order to improve the efficiency of magnetoresistive sensor, we synthesized La₀.₈Sr₀.₂MnO₃ polycrystalline bulks at different sintering temperatures and investigated their DC and AC transport properties in this work. As a result, all samples showed insulator–metal (I–M) phase transition, and the transition temperature (TI–M) shifted to higher temperature with the increase of sintering temperature. The TI–M measured at different AC frequencies was smaller than that measured at DC condition, which implied that the I–M phase transition was suppressed at AC frequencies. The resistivity measured at high AC frequencies was larger than that measured at low AC frequencies, which could be attributed to the change of the magnetic penetration depth (δ). However, the room-temperature AC-magnetoresistance (MR) at low frequencies was much larger than that at high frequencies and room-temperature DC-MR. These findings demonstrate that reducing the AC frequency is an effective way for enhancing the room-temperature MR, which can be used to promote the efficiency of magnetoresistive sensor.

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    • © 2014 Zhantao Wei et al. The contents of this paper reflect the views of the author[s] and do not necessarily reflect the official views or policies of the Transportation Research Board or the National Academy of Sciences.
  • Authors:
    • Wei, Zhantao
    • Yang, Xinsheng
    • Lv, Li
    • Zhang, Min
    • Zhang, Yong
  • Publication Date: 2014-6

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  • English

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  • Accession Number: 01602029
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 24 2016 10:39AM