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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/039/01/0091-0096

    • Keywords

       

      Thermal-pressure treatment; interfacial effect; electrical/magnetic transport; microstructure; manganites.

    • Abstract

       

      Polycrystalline ceramics Nd0.7Sr0.3MnOy prepared by solid-state reaction were treated under high pressure of 9 GPa and temperature of 1000 K. The electrical transport behaviour of samples were investigated by a variable temperature system and a peculiar transport character was found at low temperature of 120 K, the I–V showed an obvious step-shape behaviour with the increase in the measurement voltages; at much lower temperature of 12.3 K, the I–V curves exhibited a notable symmetric hysteresis at a critical voltage of 4.5 V, although a linear I–V behaviour at 293 K. On the other hand, the R–T measurement revealed that the resistivity peak (resistivity at 𝑇MI) disappeared gradually and is replaced by a resistivity platform with the increase in the load currents, surprisingly, the resistivity platform broadened with continuous increase in the load currents but weakened when an external magnetic field was applied. All of these phenomena were not observed for the un-treated sample. The particle attenuated and the enhanced interface effect which resulted from the violent thermal-pressure treatment was responsible for the unique electromagnetic transport.

    • Author Affiliations

       

      Shunsheng Chen1 2 Dawei Shi2 Shaozhen Li1 Changping Yang2 Yali Zhang3

      1. Institute for Quantum Materials and School of Mathematics and Physics, Hubei Polytechnic University, Huangshi 435003, PR China
      2. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Faculty of Physics & Electronic Science, Hubei University, Wuhan 430062, PR China
      3. Xinyang Vocational & Technical College, The School of Mathematics and Computer Science, Xinyang 464000, PR China

    • Dates

       
      Published
      February 2016
      Manuscript received
      28 October 2014
      Accepted
      7 September 2015

  • Bulletin of Materials Science | News

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