Spin dynamics in antiferromagnetic oxypnictides and fluoropnictides: LaMnAsO, LaMnSbO, and BaMnAsF

Islam, Farhan; Gordon, Elijah; Das, Pinaki; Liu, Yong; Ke, Liqin; Abernathy, Douglas L.; McQueeney, Robert J.; Vaknin, David

doi:10.1103/PhysRevB.101.155119

Title: Spin dynamics in antiferromagnetic oxypnictides and fluoropnictides: LaMnAsO, LaMnSbO, and BaMnAsF

Journal Article · 14 April 2020 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.101.155119 · OSTI ID:1616551

Islam, Farhan ^[1]; Gordon, Elijah ^[1]; Das, Pinaki ^[1]; Liu, Yong ^[1]; Ke, Liqin ^[1];

^[2]; McQueeney, Robert J. ^[3];

^[3]

Ames Laboratory (AMES), Ames, IA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

In this study, inelastic neutron scattering (INS) from polycrystalline antiferromagnetic LaMnAsO, LaMnSbO, and BaMnAsF are analyzed using a $J_{1} - J_{2} - J_{c}$ Heisenberg model in the framework of the linear spin-wave theory. All three systems show clear evidence that the nearest- and next-nearest-neighbor interactions within the Mn square lattice layer ( $J_{1}$ and $J_{2}$ ) are both antiferromagnetic (AFM). However, for all compounds studied the competing interactions have a ratio of $2 J_{2} / J_{1} < 1$ , which favors the square lattice checkerboard AFM structure over the stripe AFM structure. The interplane coupling $J_{c}$ in all three systems is on the order of $~ 3 \times 10^{- 4} J_{1}$ , rendering the magnetic properties of these systems with quasi-two-dimensional character. The substitution of Sb for As significantly lowers the in-plane exchange coupling, which is also reflected in the decrease of the Néel temperature, $T_{N}$ . Although BaMnAsF shares the same MnAs sheets as LaMnAsO, their $J_{1}$ and $J_{2}$ values are substantially different. Lastly, using density functional theory, we calculate exchange parameters $J_{i j}$ to rationalize the differences among these systems.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1616551

Report Number(s):: IS--J 10,206

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 15 Vol. 101; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Spin dynamics in antiferromagnetic oxypnictides and fluoropnictides: LaMnAsO, LaMnSbO, and BaMnAsF

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