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Adsorption-controlled growth of MnTe(Bi2Te3)n by molecular beam epitaxy exhibiting stoichiometry-controlled magnetism

Jason Lapano, Lauren Nuckols, Alessandro R. Mazza, Yun-Yi Pai, Jie Zhang, Ben Lawrie, Rob G. Moore, Gyula Eres, Ho Nyung Lee, Mao-Hua Du, T. Zac Ward, Joon Sue Lee, William J. Weber, Yanwen Zhang, and Matthew Brahlek
Phys. Rev. Materials 4, 111201(R) – Published 11 November 2020
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Abstract

We report the growth of the intrinsic magnetic topological system MnTe(Bi2Te3)n by molecular beam epitaxy. By mapping the temperature and the Bi:Mn flux ratio, it is shown that there is a narrow growth window for the n=1 phase MnBi2Te4 with 2.0<Bi:Mn<2.6 at 225 °C. Here the films are stoichiometric and excess Bi and Te is not incorporated. At higher flux ratios (Bi:Mn≥4.5) it is found that the n=2MnBi4Te7 phase is stabilized. Transport measurements indicate that the MnBi2Te4 and MnBi4Te7 undergo magnetic transitions around 25 and 10 K, respectively, consistent with antiferromagnetic phases found in the bulk. Further, for Mn-rich conditions (Bi:Mn<2), ferromagnetism emerges that exhibits a clear hysteretic state in the Hall effect, which likely indicates Mn-doped MnBi2Te4. Understanding how to grow ternary chalcogenide phases is the key to synthesizing new materials and to interface magnetism and topology, which together are routes to realize and control exotic quantum phenomena.

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  • Received 15 September 2020
  • Accepted 20 October 2020

DOI:https://doi.org/10.1103/PhysRevMaterials.4.111201

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsQuantum Information, Science & Technology

Authors & Affiliations

Jason Lapano1, Lauren Nuckols2, Alessandro R. Mazza1, Yun-Yi Pai1, Jie Zhang1, Ben Lawrie1, Rob G. Moore1, Gyula Eres1, Ho Nyung Lee1, Mao-Hua Du1, T. Zac Ward1, Joon Sue Lee3, William J. Weber2, Yanwen Zhang1,2, and Matthew Brahlek1,*

  • 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 2Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 3Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA

  • *brahlekm@ornl.gov

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Vol. 4, Iss. 11 — November 2020

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