Incommensurate and commensurate antiferromagnetic states in CaMn2As2 and SrMn2As2 revealed by As75 NMR

Ding, Q. -P.; Sangeetha, N. S.; Pandey, Abhishek; Johnston, D. C.; Furukawa, Y.

doi:10.1103/physrevb.104.224413

Incommensurate and commensurate antiferromagnetic states in Ca Mn2 As2 and Sr Mn2 As2 revealed by As 75 NMR

Journal Article · Thu Dec 09 00:00:00 EST 2021 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.104.224413· OSTI ID:1875277

^[1]; Sangeetha, N. S. ^[2]; ^[3]; ^[1]; ^[1]

Ames Lab., and Iowa State Univ., Ames, IA (United States)
Ames Lab., and Iowa State Univ., Ames, IA (United States); Ruhr Univ., Bochum (Germany)
Ames Lab., and Iowa State Univ., Ames, IA (United States); Univ. of the Witwatersrand, Gauteng (South Africa)

Here, we carried out ⁷⁵As nuclear magnetic resonance (NMR) measurements on the trigonal CaMn₂ As₂ and SrMn₂ As₂ insulators exhibiting antiferromagnetic (AFM) ordered states below Néel temperatures T_N = 62 and 120 K, respectively. In the paramagnetic state above T_N, typical quadrupolar-split ⁷⁵As NMR spectra were observed for both systems. The ⁷⁵As quadrupolar frequency ν_Q for CaMn₂ As₂ decreases with decreasing temperature, while ν_Q for SrMn₂ As₂ increases, showing an opposite temperature dependence. In the AFM state, the relatively sharp and distinct ⁷⁵As NMR lines were observed in SrMn₂ As₂ and the NMR spectra were shifted to lower fields for both magnetic fields H ∥ c axis and H ∥ a b plane, suggesting that the internal fields B_int at the As site produced by the Mn ordered moments are nearly perpendicular to the external magnetic field direction. No obvious distribution of B_int was observed in SrMn₂ As₂, which clearly indicates a commensurate AFM state. In sharp contrast to SrMn₂ As₂, broad and complex NMR spectra were observed in CaMn₂ As₂ in the AFM state, which clearly shows a distribution of B_int at the As site, indicating an incommensurate state. From the analysis of the characteristic shape of the observed spectra, the AFM state of CaMn₂ As₂ was determined to be a two-dimensional incommensurate state where Mn ordered moments are aligned in the ab plane. A possible origin for the different AFM states in the systems was discussed. Both CaMn₂ As₂ and SrMn₂ As₂ show very large anisotropy in the nuclear spin-lattice relaxation rate 1/T₁ in the paramagnetic state. 1/T₁ for H ∥ ab is much larger than that for H ∥ c, indicating strong anisotropic AFM spin fluctuations in both compounds.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1875277

Report Number(s):: IS-J 10,674

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 22 Vol. 104; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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