Title: Evolution of magnetic interactions in Sb-substituted MnBi2Te4

Journal Article · · Physical Review B
ORCiD logo [1]; ORCiD logo [2];  [1];  [3]; ORCiD logo [1]; ORCiD logo [2];  [4]
  1. Ames Lab., Ames, IA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  4. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
+ Show Author Affiliations

The Mn(Bi1–xSbx)2Te4 series is purported to span from an antiferromagnetic (AF) topological insulator at x = 0 to a trivial AF insulator at x = 1. Here we report on neutron diffraction and inelastic neutron scattering studies of the magnetic interactions across this series. All compounds measured possess ferromagnetic (FM) triangular layers and we find a crossover from AF to FM interlayer coupling near x = 1 for our samples. The large spin gap at x = 0 closes rapidly and the average FM exchange interactions within the triangular layer increase with Sb substitution. Similar to a previous study of MnBi2Te4, we find severe spectral broadening which increases dramatically across the compositional series. In addition to broadening, we observe an additional sharp magnetic excitation in MnSb2Te4 that may indicate the development of local magnetic modes originating from antisite disorder between Mn and Sb sublattices. Here, the results suggest that both substitutional and antisite disorder contribute substantially to the magnetism in Mn(Bi1–xSbx)2Te4.

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:
AC02-07CH11358; AC05-00OR22725
OSTI ID:
1818951
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 6 Vol. 104; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (32)

Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set journal July 1996
Interplay of Dirac electrons and magnetism in CaMnBi2 and SrMnBi2 journal December 2016
Intrinsic magnetic topological insulator phases in the Sb doped MnBi2Te4 bulks and thin flakes journal October 2019
Prediction and observation of an antiferromagnetic topological insulator journal December 2019
Magnetized topological insulator multilayers journal October 2020
Experimental Realization of an Intrinsic Magnetic Topological Insulator * journal June 2019
Highly-ordered wide bandgap materials for quantized anomalous Hall and magnetoelectric effects journal April 2017
Evolution of structural, magnetic, and transport properties in MnBi 2 − x Sb x Te 4 journal September 2019
Realization of interlayer ferromagnetic interaction in MnS b 2 T e 4 toward the magnetic Weyl semimetal state journal November 2019
Crystal and magnetic structures of magnetic topological insulators MnBi 2 Te 4 and MnBi 4 Te 7 journal January 2020
Signatures of coupling between spin waves and Dirac fermions in YbMnBi 2 journal January 2020
Gapless Dirac surface states in the antiferromagnetic topological insulator MnBi 2 Te 4 journal April 2020
Magnetic anisotropy in low-dimensional ferromagnetic systems: Fe monolayers on Ag(001), Au(001), and Pd(001) substrates journal September 1990
Projector augmented-wave method journal December 1994
Electron-energy-loss spectra and the structural stability of nickel oxide: An LSDA+U study journal January 1998
From ultrasoft pseudopotentials to the projector augmented-wave method journal January 1999
Determination of the exchange anisotropy in perovskite antiferromagnets using powder inelastic neutron scattering journal November 2008
Antiferromagnetic topological insulators journal June 2010
Chiral gauge field and axial anomaly in a Weyl semimetal journal June 2013
Unique Thickness-Dependent Properties of the van der Waals Interlayer Antiferromagnet MnBi 2 Te 4 Films journal March 2019
Topological Axion States in the Magnetic Insulator MnBi 2 Te 4 with the Quantized Magnetoelectric Effect journal May 2019
Competing Magnetic Interactions in the Antiferromagnetic Topological Insulator MnBi 2 Te 4 journal April 2020
Coexistence of Surface Ferromagnetism and a Gapless Topological State in MnBi 2 Te 4 journal September 2020
Generalized Gradient Approximation Made Simple journal October 1996
Crystal growth and magnetic structure of MnBi 2 Te 4 journal June 2019
Spin scattering and noncollinear spin structure-induced intrinsic anomalous Hall effect in antiferromagnetic topological insulator MnB i 2 T e 4 journal August 2019
Site Mixing for Engineering Magnetic Topological Insulators journal May 2021
Gapless Surface Dirac Cone in Antiferromagnetic Topological Insulator MnBi 2 Te 4 journal November 2019
Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn 2 As 2 and MnBi 2 n Te 3 n + 1 journal November 2019
Topological Electronic Structure and Its Temperature Evolution in Antiferromagnetic Topological Insulator MnBi 2 Te 4 journal November 2019
GSAS-II : the genesis of a modern open-source all purpose crystallography software package journal March 2013
Quantum anomalous Hall effect in intrinsic magnetic topological insulator MnBi 2 Te 4 journal January 2020

Similar Records

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Magnetic interactions
Magnetic order
Magnons
Neutron scattering
Spin-orbit coupling
Topological materials