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Journal of Superconductivity and Novel Magnetism

, Volume 32, Issue 12, pp 3979–3986 | Cite as

Effects of Dy Doping on the Electrical Transport and Magnetic Properties of the Pyrochlore Iridate Bi2Ir2O7

  • Yuan Feng
  • Jian Bian
  • Shiyun Chen
  • Baolong Fang
  • Wei Tong
  • Hui LiuEmail author
Original Paper

Abstract

In the present paper, we report the structural, electrical, and magnetic properties of Bi2-xDyxIr2O7 (x = 0, 0.5, 1.0, 1.5, 2.0) polycrystalline. Raman scattering spectra show the variation of active mode with doping induced by the changes of bond strength and the ionic masses. The resistivity behaviors show that the substitution of dysprosium significantly enhances the electrical resistance and presents a metal-insulator transition at about 60 K for the x = 1.5 samples. Fitted data of metallic regions indicate the importance of grain boundary effects while transport mechanism of insulating regions changes from thermal activation to variable range hopping model. Magnetic measurements suggest predominantly antiferromagnetic (AFM) interaction. With increasing content of Dy, the AFM interactions increase at first and then decrease, resulting from the competition among AFM Ir-Ir, AFM Ir-Dy, and ferromagnetic (FM) Dy-Dy interactions.

Keywords

Doped iridate Metal-insulator transition Grain boundary effects Magnetic properties 

Notes

Acknowledgments

We acknowledge the use of electron spin resonance facilities at the High Magnetic Field Laboratory, Chinese Academy of Sciences at Hefei.

Funding Information

This work was supported by the Natural Science Foundation of China (Grant No. 11604071), Natural Science Foundation of the Education Department of Anhui Province (Grant Nos. KJ2016SD49, KJ2017A548, 2016jyxm0864, and 2016jyxm0865), and Natural Science Foundation of Hefei University (Grant Nos. 18ZR13ZDA and 2016dtr02).

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Authors and Affiliations

  1. 1.Department of Mathematics and PhysicsHefei UniversityHefeiChina
  2. 2.Analytical and Testing CenterHefei UniversityHefeiChina
  3. 3.High Magnetic Field LaboratoryChinese Academy of SciencesHefeiChina

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