Crystal Defect Doping on Antiferromagnetic Topological Insulator Candidate EuMg2Bi2

Madalynn Marshall, Weiwei Xie

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Here, we report defect doping from partial substitution doping on the magnetic Eu2+ site with the nonmagnetic alkaline-earth metal Ca2+ in the magnetic topological candidate EuMg2Bi2. Resultantly, two new phases Eu0.50(5)Ca0.50Mg2Bi2 and Eu0.33(2)Ca0.67Mg2Bi2 were discovered, and the magnetic and electrical measurements were performed and analyzed. A ferromagnetic behavior is realized with increased Ca-doping for Eu0.33Ca0.67Mg2Bi2, while Eu0.50Ca0.50Mg2Bi2 remains antiferromagnetic with a significantly lower transition temperature compared to EuMg2Bi2. Consequently, the electrical properties of Eu0.33Ca0.67Mg2Bi2, displaying a semimetallic behavior with negative magnetoresistance, closely resemble those of EuMg2Bi2. However, factors including the fluctuating Eu site defects and magnetic fields strongly influence the resistivity of Eu0.50Ca0.50Mg2Bi2 leading to a large positive magnetoresistance and a semimetal-to-semiconductor transition. Ultimately, these results suggest that EuMg2Bi2 could be a tunable platform to study the surface states in antiferromagnetic topological insulators.

Original languageEnglish (US)
Pages (from-to)737-742
Number of pages6
JournalJournal of Physical Chemistry C
Issue number1
StatePublished - Jan 13 2022

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films


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