Evolution of structural, magnetic, and transport properties in MnBi2-xSbxTe4
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725; AC0500OR22725; AC02-07CH11358
- OSTI ID:
- 1561643
- Alternate ID(s):
- OSTI ID: 1560307; OSTI ID: 1562680
- Report Number(s):
- IS-J-10040; TRN: US2000633
- Journal Information:
- Physical Review B, Vol. 100, Issue 10; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
Evolution of magnetic interactions in Sb-substituted MnBi2Te4
A-type antiferromagnetic order in MnBi4Te7 and MnBi6Te10 single crystals