Infrared study of the layered magnetic insulator Mn(Bi0.07Sb0.93)2Te4 at low temperatures

M. Köpf, S. H. Lee, Harish Kumar, Z. Q. Mao, and C. A. Kuntscher
Phys. Rev. B 105, 195125 – Published 18 May 2022

Abstract

Topological insulators with intrinsic magnetic ordering, potentially hosting rare quantum effects, recently attracted extensive attention. MnBi2Te4 is the first established example. The Sb-doped variant Mn(Bi1xSbx)2Te4 shows a great variety of electronic properties depending on the Sb content x, such as shifts in the Fermi level and the Néel temperature TN, and the change of the free charge carrier type from n to p type at high Sb substitution ratios. Here, we investigate the effect of magnetic ordering on the bulk electronic structure of Mn(Bi1xSbx)2Te4 with high Sb content x=0.93 by temperature-dependent reflectivity measurements over a broad frequency range. We observe anomalies in the optical response across TN when the antiferromagnetic order sets, which suggests a coupling between the magnetic ordering and the electronic structure of the material.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 24 February 2022
  • Revised 13 April 2022
  • Accepted 3 May 2022

DOI:https://doi.org/10.1103/PhysRevB.105.195125

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. Köpf1, S. H. Lee2,3, Harish Kumar1, Z. Q. Mao2,3,4, and C. A. Kuntscher1,*

  • 1Experimentalphysik II, Institute of Physics, Augsburg University, 86159 Augsburg, Germany
  • 22D Crystal Consortium, Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA
  • 3Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA
  • 4Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA

  • *christine.kuntscher@physik.uni-augsburg.de

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 105, Iss. 19 — 15 May 2022

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×