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Title: Antiferromagnetism in semiconducting SrMn 2 Sb 2 and BaMn 2 Sb 2 single crystals

Abstract

Here, crystals of SrMn 2Sb 2 and BaMn 2Sb 2 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 C p, and magnetic susceptibility χ measurements versus temperature T, and magnetization versus field M(H) isotherm measurements. SrMn 2Sb 2 adopts the trigonal CaAl 2Si 2-type structure, whereas BaMn 2Sb 2 crystallizes in the tetragonal ThCr 2Si 2-type structure. The ρ(T) data indicate semiconducting behaviors for both compounds with activation energies of ≳0.35 eV for SrMn 2Sb 2 and 0.16 eV for BaMn 2Sb 2. The χ(T) and C p(T) data reveal antiferromagnetic (AFM) ordering at T N = 110 K for SrMn 2Sb 2 and 450 K for BaMn 2Sb 2. The anisotropic χ(T≤T N) data also show that the ordered moments in SrMn 2Sb 2 are aligned in the hexagonal ab plane, whereas the ordered moments in BaMn 2Sb 2 are aligned collinearly along the tetragonal c axis. The ab-plane M(H) data for SrMn 2Sb 2 exhibit a continuous metamagnetic transition at low fields 02Sb 2 exhibits no metamagnetic transitions up to 5.5 T. The χ(T) and C p(T) data for both SrMn 2Sb 2 andmore » BaMn 2Sb 2 indicate strong dynamic short-range AFM correlations above their respective T N 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 CaAl 2Si 2 and ThCr 2Si 2 crystal structures show that the T N values for the CaAl 2Si 2-type compounds are much smaller than those for the ThCr 2Si 2-type materials.« less

Authors:
 [1];  [2];  [2];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Stockholm Univ., Stockholm (Sweden)
Publication Date:
Research Org.:
Ames Laboratory (AMES), 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:
Journal Article: 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. doi: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. doi: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},
issn = {2469-9950},
number = 1,
volume = 97,
place = {United States},
year = {2018},
month = {1}
}

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Cited by: 5 works
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Figures / Tables:

TABLE I: TABLE I:: Properties of 1111-type and 122-type Mn pnictides, including results from the present work (PW). Included are the structure type, AFM ordering temperatures TN, low temperature ordered moment µ, and semiconducting activation energy . The ZrCuSiAs structure is primitive tetragonal with space group P4/nmm, the ThCr2Si2 structure is body-centeredmore » tetragonal with space group I4/mmm, and the CaAl2Si2 structure is trigonal with space group Pm1. Unless otherwise indicated, was determined from electrical resistivity data with the current in the crystallographic ab plane of single-crystal samples.« less

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