Structual, Magnetic, and Transport Properties of LaMn1-xCuxO3 (x= 0-0.125) Ceramics

Document Type : Original Research Article

Authors

1 Department of Physics, Isfahan University of Technology, Isfahan, Isfahan, Iran

2 Department of Physics, Semnan University, Semnan, Semnan, Iran

3 Department of Physics, University of Tabriz, Tabriz 51666-16471, Iran

Abstract

The present study investigates the structural, magnetic, and electrical properties of non-stoichiometric  LaMn1-xCuxO3 (x= 0, 0.025, 0.05, 0.075, and 0.125) ceramics. The results of X-ray diffraction refinement indicated that all samples were crystallized in an orthorhombic structure and no apparent crystal structure change was introduced by doping Cu up to x=0.125. The Ferromagnetic (FM) nature revealed by non-stoichiometric LaMn1-xCuxO3-d was verified through the appearance of Paramagnetic-Ferromagnetic (PM-FM) transition temperatures in AC magnetic susceptibility measurement of the samples. Due to the coexistence of Antiferromagnetic (AFM) and FM phases, all samples contained Re-entrant Spin Glass (RSG) and Cluster Spin Glass (CSG) states. The results showed that FM phase was comparable or even dominant in the doped samples up to x=0.075; however, after doping, AFM phase overcame the FM phase as a result of reduction of double exchange interaction. Temperature dependence of resistivity measurement indicated that upon increasing the Cu-doping level, resistivity decreased, except for the x=0.125 sample, and that metal-insulator transition at low temperatures was detected in the doped samples. Furthermore, changing the magnetic phase in the case of x=0.125 sample from FM (in x=0.075) to AFM dominant phase was accompanied by changing the transport parameters obtained from small polaron hopping models.

Keywords

Main Subjects

References

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Advanced Ceramics Progress
Volume 7, Issue 1
Winter 2021
Pages 1-10

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  • Receive Date: 13 September 2020
  • Revise Date: 09 November 2020
  • Accept Date: 21 November 2020

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