Spin Dynamics in the Antiferromagnetic Oxypnictides and Fluoropnictides: LaMnAsO, LaMnSbO, and BaMnAsF
arXiv:2001.02268 · doi:10.1103/PhysRevB.101.155119
Abstract
Inelastic neutron scattering (INS) from polycrystalline antiferromagnetic LaMnAsO, LaMnSbO, and BaMnAsF are analyzed using a 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 ( and ) are both antiferromagnetic (AFM). However, for all compounds studied the competing interactions have a ratio of , which favors the square lattice checkerboard AFM structure over the stripe AFM structure. The inter-plane coupling in all three systems is on the order of , 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 N{é}el temperature, . Although BaMnAsF shares the MnAs sheets as LaMnAsO, their and values are substantially different. Using density functional theory, we calculate exchange parameters to rationalize the differences among these systems.
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