Title: Crystal growth and magnetic structure of ${\mathrm{MnBi}}_2{\mathrm{Te}}_4$

Abstract

Millimeter-sized ${\mathrm{MnBi}}_2{\mathrm{Te}}_4$ single crystals are grown out of a Bi-Te flux and characterized using magnetic, transport, scanning tunneling microscopy, and spectroscopy measurements. The magnetic structure of ${\mathrm{MnBi}}_2{\mathrm{Te}}_4$ below T_N is determined by powder and single-crystal neutron diffraction measurements. Below T_N = 24 K, Mn²⁺ moments order ferromagnetically in the ab plane but antiferromagnetically along the crystallographic c axis. The ordered moment is 4.04(13)μ_B/Mn at 10 K and aligned along the crystallographic c axis in an A-type antiferromagnetic order. Below T_N, the electrical resistivity drops upon cooling or when going across the metamagnetic transition in increasing magnetic fields. A critical scattering effect is observed in the vicinity of T_N in the temperature dependence of thermal conductivity, indicating strong spin-lattice coupling in this compound. Yet, no anomaly is observed in the temperature dependence of thermopower around T_N. Fine tuning of the magnetism and/or electronic band structure is needed for the proposed topological properties of this compound. The growth protocol reported here might be applied to grow high-quality crystals where the electronic band structure and magnetism can be finely tuned by chemical substitutions.

Authors:

Yan, Jiaqiang  ^[1];

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Zhang, Qiang  ^[1];

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Heitmann, Thomas ^[2]; Huang, Zengle ^[3]; Chen, K. Y. ^[4]; Cheng, J. -G. ^[5]; Wu, Weida ^[3]; Vaknin, David ^[6]; Sales, Brian C.  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-6335-5912"
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McQueeney, Robert John ^[6]

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+ Show Author Affiliations

1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
2. Univ. of Missouri, Columbia, MO (United States)
3. Rutgers Univ., Piscataway, NJ (United States)
4. Chinese Academy of Sciences (CAS), Beijing (China)
5. Chinese Academy of Sciences (CAS), Beijing (China); Songshan Lake Materials Lab., Guangdong (China)
6. Ames Lab. and Iowa State Univ., Ames, IA (United States)

Publication Date:

2019-06-07

Research Org.:

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

OSTI Identifier:

1524865

Alternate Identifier(s):

OSTI ID: 1546219

Grant/Contract Number:  

AC05-00OR22725; AC02-07CH11358

Resource Type:

Accepted Manuscript

Journal Name:

Physical Review Materials

Additional Journal Information:

Journal Volume: 3; Journal Issue: 6; Journal ID: ISSN 2475-9953

Publisher:

American Physical Society (APS)

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY