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Title: Evolution of structural, magnetic, and transport properties in MnBi 2-xSb xTe 4

Abstract

In this work we report the evolution of structural, magnetic, and transport properties in MnBi 2-xSb xTe 4(0 ≤ x ≤ 2) single crystals. MnSb 2Te 4, isostructural to MnBi 2Te 4, is successfully synthesized in single-crystal form. Magnetic measurements suggest an antiferromagnetic order below TN=19K for MnSb 2Te 4 with the magnetic moments aligned along the crystallographic c axis. With increasing Sb content in MnBi 2-xSb xTe 4, the a-lattice parameter decreases linearly following Vegard's law, while the c-lattice parameter shows little compositional dependence. The contraction along a is caused by the reduction of the Mn-Te-Mn bond angle, while the Mn-Te bond length remains nearly constant. The antiferromagnetic ordering temperature slightly decreases from 24 K for MnBi 2Te 4 to 19 K for MnSb 2Te 4. More dramatic change was observed for the critical magnetic fields required for the spin-flop transition and the moment saturation. Both critical fields decrease with increasing Sb content for x ≤ 1.72; a spin-flip transition occurs in MnSb 2Te 4 at a small field of 3 kOe applied along the c axis. In high magnetic fields, the saturation moment at 2 K shows significant suppression from 3.56 μ B/Mn for MnBi 2Te 4 tomore » 1.57 μ B/Mn for MnSb 2Te 4. Analysis of the magnetization data suggests that both the interlayer magnetic interaction and single-ion anisotropy decrease with increasing Sb content for x ≤ 1.72. The partial substitution of Bi by Sb also dramatically affects the transport properties. A crossover from n-type to p-type conducting behavior is observed around x ≈0.63. Our findings show close correlation between structural, magnetic, and transport properties in MnBi 2-xSb xTe 4 and that partial substitution of Bi by Sb is an effective approach to fine tuning both the magnetism and transport properties of MnBi 2-xSb xTe 4.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1561643
Alternate Identifier(s):
OSTI ID: 1560307; OSTI ID: 1562680
Report Number(s):
IS-J-10040
Journal ID: ISSN 2469-9950
Grant/Contract Number:  
AC05-00OR22725; AC0500OR22725; AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 10; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Yan, Jiaqiang, Okamoto, Satoshi, McGuire, Michael A., May, Andrew F., McQueeney, Robert John, and Sales, Brian C. Evolution of structural, magnetic, and transport properties in MnBi2-xSbxTe4. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.104409.
Yan, Jiaqiang, Okamoto, Satoshi, McGuire, Michael A., May, Andrew F., McQueeney, Robert John, & Sales, Brian C. Evolution of structural, magnetic, and transport properties in MnBi2-xSbxTe4. United States. doi:10.1103/PhysRevB.100.104409.
Yan, Jiaqiang, Okamoto, Satoshi, McGuire, Michael A., May, Andrew F., McQueeney, Robert John, and Sales, Brian C. Wed . "Evolution of structural, magnetic, and transport properties in MnBi2-xSbxTe4". United States. doi:10.1103/PhysRevB.100.104409.
@article{osti_1561643,
title = {Evolution of structural, magnetic, and transport properties in MnBi2-xSbxTe4},
author = {Yan, Jiaqiang and Okamoto, Satoshi and McGuire, Michael A. and May, Andrew F. and McQueeney, Robert John and Sales, Brian C.},
abstractNote = {In this work we report the evolution of structural, magnetic, and transport properties in MnBi2-xSbxTe4(0 ≤ x ≤ 2) single crystals. MnSb2Te4, isostructural to MnBi2Te4, is successfully synthesized in single-crystal form. Magnetic measurements suggest an antiferromagnetic order below TN=19K for MnSb2Te4 with the magnetic moments aligned along the crystallographic c axis. With increasing Sb content in MnBi2-xSbxTe4, the a-lattice parameter decreases linearly following Vegard's law, while the c-lattice parameter shows little compositional dependence. The contraction along a is caused by the reduction of the Mn-Te-Mn bond angle, while the Mn-Te bond length remains nearly constant. The antiferromagnetic ordering temperature slightly decreases from 24 K for MnBi2Te4 to 19 K for MnSb2Te4. More dramatic change was observed for the critical magnetic fields required for the spin-flop transition and the moment saturation. Both critical fields decrease with increasing Sb content for x ≤ 1.72; a spin-flip transition occurs in MnSb2Te4 at a small field of 3 kOe applied along the c axis. In high magnetic fields, the saturation moment at 2 K shows significant suppression from 3.56 μB/Mn for MnBi2Te4 to 1.57 μB/Mn for MnSb2Te4. Analysis of the magnetization data suggests that both the interlayer magnetic interaction and single-ion anisotropy decrease with increasing Sb content for x ≤ 1.72. The partial substitution of Bi by Sb also dramatically affects the transport properties. A crossover from n-type to p-type conducting behavior is observed around x ≈0.63. Our findings show close correlation between structural, magnetic, and transport properties in MnBi2-xSbxTe4 and that partial substitution of Bi by Sb is an effective approach to fine tuning both the magnetism and transport properties of MnBi2-xSbxTe4.},
doi = {10.1103/PhysRevB.100.104409},
journal = {Physical Review B},
number = 10,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}

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