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Defect-driven ferrimagnetism and hidden magnetization in MnBi2Te4

Journal Article · · Physical Review B
 [1];  [2];  [3];  [1];  [4]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Ames Lab., Ames, IA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Ames Lab., and Iowa State Univ., Ames, IA (United States)
+ Show Author Affiliations

MnBi2Te4 (MBT) materials are promising antiferromagnetic topological insulators in which field-driven ferromagnetism is predicted to cause a transition between axion insulator and Weyl semimetallic states. However, the presence of antiferromagnetic coupling between Mn/Bi antisite defects and the main Mn layer can reduce the low-field magnetization, and it has been shown that such defects are more prevalent in the structurally identical magnetic insulator MnSb2Te4 (MST). We use high-field magnetization measurements to show that the magnetization of MBT and MST occur in stages and full saturation requires fields of ~60 T. As a consequence, the low-field magnetization plateau state in MBT, where many determinations of the quantum anomalous Hall state are studied, actually consists of ferrimagnetic septuple blocks containing both uniform and staggered magnetization components.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1807199
Alternate ID(s):
OSTI ID: 1809247
OSTI ID: 1819157
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 18 Vol. 103; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Defects
Density functional theory
Magnetic systems
Magnetism
Magnetization measurements
Monte Carlo methods
Single crystal materials
Topological materials