Antiferromagnetism in semiconducting and single crystals
Abstract
Here, crystals of SrMn2Sb2 and BaMn2Sb2 were grown using Sn flux and characterized by powder and single-crystal x-ray diffraction, respectively, and by single-crystal electrical resistivity ρ, heat capacity Cp, and magnetic susceptibility χ measurements versus temperature T, and magnetization versus field M(H) isotherm measurements. SrMn2Sb2 adopts the trigonal CaAl2Si2-type structure, whereas BaMn2Sb2 crystallizes in the tetragonal ThCr2Si2-type structure. The ρ(T) data indicate semiconducting behaviors for both compounds with activation energies of ≳0.35 eV for SrMn2Sb2 and 0.16 eV for BaMn2Sb2. The χ(T) and Cp(T) data reveal antiferromagnetic (AFM) ordering at TN = 110 K for SrMn2Sb2 and 450 K for BaMn2Sb2. The anisotropic χ(T≤TN) data also show that the ordered moments in SrMn2Sb2 are aligned in the hexagonal ab plane, whereas the ordered moments in BaMn2Sb2 are aligned collinearly along the tetragonal c axis. The ab-plane M(H) data for SrMn2Sb2 exhibit a continuous metamagnetic transition at low fields 02Sb2 exhibits no metamagnetic transitions up to 5.5 T. The χ(T) and Cp(T) data for both SrMn2Sb2 and BaMn2Sb2 indicate strong dynamic short-range AFM correlations above their respective TN up to at least 900 K within a local-moment picture, corresponding to quasi-two-dimensional magnetic behavior. The present results and a survey of themore »
- Authors:
-
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Stockholm Univ., Stockholm (Sweden)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1417355
- Alternate Identifier(s):
- OSTI ID: 1415526
- Report Number(s):
- IS-J-9555
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1801041
- Grant/Contract Number:
- AC02-07CH11358
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 97; Journal Issue: 1; 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
Sangeetha, N. S., Smetana, V., Mudring, A. -V., and Johnston, D. C. Antiferromagnetism in semiconducting SrMn2Sb2 and BaMn2Sb2 single crystals. United States: N. p., 2018.
Web. doi:10.1103/PhysRevB.97.014402.
Sangeetha, N. S., Smetana, V., Mudring, A. -V., & Johnston, D. C. Antiferromagnetism in semiconducting SrMn2Sb2 and BaMn2Sb2 single crystals. United States. https://doi.org/10.1103/PhysRevB.97.014402
Sangeetha, N. S., Smetana, V., Mudring, A. -V., and Johnston, D. C. Wed .
"Antiferromagnetism in semiconducting SrMn2Sb2 and BaMn2Sb2 single crystals". United States. https://doi.org/10.1103/PhysRevB.97.014402. https://www.osti.gov/servlets/purl/1417355.
@article{osti_1417355,
title = {Antiferromagnetism in semiconducting SrMn2Sb2 and BaMn2Sb2 single crystals},
author = {Sangeetha, N. S. and Smetana, V. and Mudring, A. -V. and Johnston, D. C.},
abstractNote = {Here, crystals of SrMn2Sb2 and BaMn2Sb2 were grown using Sn flux and characterized by powder and single-crystal x-ray diffraction, respectively, and by single-crystal electrical resistivity ρ, heat capacity Cp, and magnetic susceptibility χ measurements versus temperature T, and magnetization versus field M(H) isotherm measurements. SrMn2Sb2 adopts the trigonal CaAl2Si2-type structure, whereas BaMn2Sb2 crystallizes in the tetragonal ThCr2Si2-type structure. The ρ(T) data indicate semiconducting behaviors for both compounds with activation energies of ≳0.35 eV for SrMn2Sb2 and 0.16 eV for BaMn2Sb2. The χ(T) and Cp(T) data reveal antiferromagnetic (AFM) ordering at TN = 110 K for SrMn2Sb2 and 450 K for BaMn2Sb2. The anisotropic χ(T≤TN) data also show that the ordered moments in SrMn2Sb2 are aligned in the hexagonal ab plane, whereas the ordered moments in BaMn2Sb2 are aligned collinearly along the tetragonal c axis. The ab-plane M(H) data for SrMn2Sb2 exhibit a continuous metamagnetic transition at low fields 02Sb2 exhibits no metamagnetic transitions up to 5.5 T. The χ(T) and Cp(T) data for both SrMn2Sb2 and BaMn2Sb2 indicate strong dynamic short-range AFM correlations above their respective TN up to at least 900 K within a local-moment picture, corresponding to quasi-two-dimensional magnetic behavior. The present results and a survey of the literature for Mn pnictides with the CaAl2Si2 and ThCr2Si2 crystal structures show that the TN values for the CaAl2Si2-type compounds are much smaller than those for the ThCr2Si2-type materials.},
doi = {10.1103/PhysRevB.97.014402},
journal = {Physical Review B},
number = 1,
volume = 97,
place = {United States},
year = {Wed Jan 03 00:00:00 EST 2018},
month = {Wed Jan 03 00:00:00 EST 2018}
}
Web of Science
Figures / Tables:
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