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Applied Physics A

, 125:745 | Cite as

Unusual electrical behaviour in sol–gel-synthesised PKMO nano-sized manganite

  • K. P. LimEmail author
  • S. W. Ng
  • L. N. Lau
  • M. M. Awang Kechik
  • S. K. Chen
  • S. A. Halim
Article
  • 70 Downloads

Abstract

Mixed-valence manganites have gained tremendous attention in the scientific research for its colossal magnetoresistance phenomenon. Nevertheless, the study devoted to praseodymium-based manganites is still limited to date. The present work aims to investigate the grain size effect on sol–gel grown nano-sized Pr0.85K0.15MnO3 (PKMO). The grain size has been modified by heat treatment ranging from 600 °C to 1000 °C. PKMO samples have been studied in detail to elucidate the correlation of spin, charge, orbital and lattice degrees of freedom. The X-ray diffraction analysis revealed that all samples exhibit in single orthorhombic phase with the space group of Pnma (62). The obtained crystallite size and average grain size are in the range of 45–115 nm and 51–210 nm, respectively. The evolution of grains intensively affects the electrical and magneto-transport properties of PKMO. The temperature dependence of the resistivity has been fitted with theoretical expressions in different temperature regimes to investigate their conduction mechanisms. The resistivity exhibits an unusual trend when the grain size increases where a similar pattern also been observed in metal–insulator transition temperature (TMI). This behaviour can be ascribed to the grain size distribution, grain formation and also the occurrence of oxygen vacancies at the grain boundaries. Enhancement of high field magnetoresistance has been discovered below 180 K, whereas low field magnetoresistance is suppressed as the temperature increases and almost vanished at 300 K. The PKMO study demonstrated here is clearly dominated by extrinsic properties (grain evolution) from the evidence of electrical and magneto-transport measurements.

Notes

Acknowledgements

This research is funded and supported by Universiti Putra Malaysia (UPM) research grants, GP/2017/9567400 and GP-IPS/2018/9663900. The authors would like to thank the supported staffs who helped in characterisation measurements and facilities provided by UPM.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Superconductor and Thin Film Laboratory, Department of Physics, Faculty of ScienceUniversiti Putra MalaysiaUPM SerdangMalaysia

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