Strong magnetic correlations to 900 K in single crystals of the trigonal antiferromagnetic insulators SrMn2As2 and CaMn2As2

Sangeetha, N. S.; Pandey, Abhishek; Benson, Zackery A.; Johnston, D. C.

doi:10.1103/PhysRevB.94.094417

Title: Strong magnetic correlations to 900 K in single crystals of the trigonal antiferromagnetic insulators ${SrMn}_{2} {As}_{2}$ and ${CaMn}_{2} {As}_{2}$

Journal Article · Thu Sep 15 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.094417· OSTI ID:1326842

Sangeetha, N. S. ^[1]; Pandey, Abhishek ^[1]; Benson, Zackery A. ^[1]; Johnston, D. C. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy

Crystallographic, electronic transport, thermal, and magnetic properties are reported for SrMn₂As₂ and CaMn₂As₂ single crystals grown using Sn flux. Rietveld refinements of powder x-ray diffraction data show that the two compounds are isostructural and crystallize in the trigonal CaAl₂Si₂-type structure (space group $$P\bar{3}$$ m1), in agreement with the literature. Electrical resistivity ρ versus temperature T measurements demonstrate insulating ground states for both compounds with activation energies of 85 meV for SrMn₂As₂ and 61 meV for CaMn₂As₂. In a local-moment picture, the Mn⁺² 3d⁵ ions are expected to have high-spin S=5/2 with spectroscopic splitting factor g≈2. Magnetic susceptibility χ and heat capacity Cp measurements versus T reveal antiferromagnetic (AFM) transitions at T_N=120(2) K and 62(3) K for SrMn₂As₂ and CaMn₂As₂, respectively. The anisotropic χ(T≤T_N) data indicate that the hexagonal c axis is the hard axis and hence that the ordered Mn moments are aligned in the ab plane. Finally, the χ(T) data for both compounds and the Cp(T) for SrMn₂As₂ show strong dynamic short-range AFM correlations from T_N up to at least 900 K, likely associated with quasi-two-dimensional connectivity of strong AFM exchange interactions between the Mn spins within the corrugated honeycomb Mn layers parallel to the ab plane.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1326842

Alternate ID(s):: OSTI ID: 1324865

Report Number(s):: IS-J-9072; PRBMDO

Journal Information:: Physical Review B, Vol. 94, Issue 9; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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Title: Strong magnetic correlations to 900 K in single crystals of the trigonal antiferromagnetic insulators ${SrMn}_{2} {As}_{2}$ and ${CaMn}_{2} {As}_{2}$