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Magnetic Properties and Charge Ordering in Polycrystalline La1-xCaxMnO3 (x = 0.2, 0.5) Manganite

  • Haiou Wang
  • Kunpeng Su
  • Shuai Huang
  • Jingyuan Ge
  • Weishi TanEmail author
  • Dexuan HuoEmail author
Original Paper
  • 23 Downloads

Abstract

In this work, we report the attractive magnetic properties of La1-xCaxMnO3 manganites with x = 0.2 (LCMO-2) and x = 0.5 (LCMO-5). X-ray diffraction (XRD) measurements show that the prepared samples are single phase and they crystallize in the orthorhombic structure with Pnma space group. Scanning electron microscope (SEM) measurements reveal that the particles of samples are homogeneous and possess the diameter of several microns. Magnetization versus temperature measurements show paramagnetic (PM) to ferromagnetic (FM) transition at TC ≈ 200 K for LCMO-2 and at TC ≈ 250 K for LCMO-5. Below TC, FM nature is observed in LCMO-2. However, LCMO-5 displays the complex magnetic phase transition. Below TC, LCMO-5 shows a FM to charge-ordered antiferromagnetic (COAFM) transition at CO temperature TCO and a novel, unexpected FM phase transition at characteristic temperature T* (near 35 K). The FM and COAFM phases coexist in LCMO-5, and the competition of FM and AFM phases lead to the unexpected FM transition at T*. Furthermore, the inverse of susceptibility versus temperature measurements confirm the similar results. Magnetic hysteresis loop measurements suggest the typical FM feature of LCMO-2. However, LCMO-5 exhibits the hysteresis loops with butterfly-type structure at 100 and 150 K, suggesting the presence of COAFM phase. These attractive magnetic properties are explained by the existence of COAFM phase and the competition between FM and COAFM phases.

Keywords

Magnetic properties Phase transition Charge ordering Perovskite manganites 

Notes

Acknowledgments

We thank our colleagues at Beijing Synchrotron Radiation Facility (BSRF) and Shanghai Synchrotron Radiation Facility (SSRF) for their help.

Funding Information

This work was supported by the Young Scientists Fund of the National Natural Science Foundation of China (11604067, 21801054, 51601049, 11704091) and the National Natural Science Foundation of China (U1832143, 11574066).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Materials and Environmental EngineeringHangzhou Dianzi UniversityHangzhouChina
  2. 2.All-solid-state Energy Storage Materials and Devices Key Laboratory of Hunan Province, College of Information and Electronic EngineeringHunan City UniversityYiyangChina
  3. 3.Key Laboratory of Soft Chemistry and Functional Materials, Ministry of Education, Department of Applied PhysicsNanjing University of Science and TechnologyNanjingChina

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