Magnetic order on the spatially anisotropic triangular lattice of is studied via neutron diffraction measurements. The transition into a commensurate, collinear antiferromagnetic ground state with was found to occur below . Above this temperature, the transition is preceded by the formation of a coexisting, short-range ordered, incommensurate state below whose two-dimensional propagation vector evolves toward as the temperature approaches . At high temperatures , quasielastic scattering reveals one-dimensional spin correlations along the nearest-neighbor Mn-Mn "chain direction" of the MnO planes. Our data are consistent with the predictions of a mean-field model of Ising-like spins on an anisotropic triangular lattice, as well as the predominantly one-dimensional Heisenberg spin Hamiltonian reported for this material.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11187984 | PMC |
| http://dx.doi.org/10.1103/PhysRevB.98.144444 | DOI Listing |
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