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Quantum critical point and ferromagnetic semiconducting behavior in p-type FeAs2

Bing-Hua Lei, Yuhao Fu, Zhenzhen Feng, and David J. Singh
Phys. Rev. B 101, 020404(R) – Published 14 January 2020

Abstract

We illustrate an approach based on itinerant magnetism for finding ferromagnetic semiconductors that can be gate tuned to study quantum critical points. We show that p-type FeAs2 is an example. The complex nonparabolic band structure of this material leads to a ferromagnetic instability when doped, while at the same time allowing for a modest transport effective mass. This leads to an analogy between magnetic semiconductors and thermoelectric materials.

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  • Received 1 September 2019
  • Revised 15 November 2019

DOI:https://doi.org/10.1103/PhysRevB.101.020404

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Bing-Hua Lei and Yuhao Fu

  • Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211-7010, USA

Zhenzhen Feng

  • Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211-7010, USA and Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng, 475004, China

David J. Singh*

  • Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211-7010, USA and Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA

  • *singhdj@missouri.edu

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Issue

Vol. 101, Iss. 2 — 1 January 2020

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