Singlet-triplet dispersion reveals additional frustration in the triangular dimer compound Ba${}_3$Mn${}_2$O${}_8$

Abstract

We present single crystal inelastic neutron scattering measurements of the S=1 dimerized quasi-two-dimensional antiferromagnet Ba${}_3$Mn${}_2$O${}_8$. The singlet-triplet dispersion reveals nearest-neighbor and next-nearest-neighbor ferromagnetic interactions between adjacent bilayers that compete against each other. Although the inter-bilayer exchange is comparable to the intra-bilayer exchange, this additional frustration reduces the effective coupling along the c-axis and leads to a quasi-two dimensional behavior. In addition, the obtained exchange values are able to reproduce the four critical fields in the phase diagram.

4 pages, 3 color figures, submitted to an APS physical review journal

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• Magnetic excitations of the gapped quantum spin dimer antiferromagnet Sr${}_3$Cr${}_2$O${}_8$
• Asymmetric quintuplet condensation in the frustrated S=1 spin dimer compound Ba3Mn2O8
• Pressure-tuning the quantum spin Hamiltonian of the triangular lattice antiferromagnet Cs${}_2$CuCl${}_4$
• Ordered magnetic phases of the frustrated spin-dimer compound Ba3Mn2O8
• Weakly coupled $s=1/2$ quantum spin singlets in Ba${}_3$Cr${}_2$O${}_8$
• Spangolite: an s=1/2 maple leaf lattice antiferromagnet?
• Néel to dimer transition in spin-S antiferromagnets: Comparing bond operator theory with quantum Monte Carlo simulations for bilayer Heisenberg models
• Non-linear bond-operator theory and 1/d expansion for coupled-dimer magnets I: Paramagnetic phase
• Disentangling orbital and spin exchange interactions for Co${}^{2+}$ on a rocksalt lattice
• Field induced multiple order-by-disorder state selection in antiferromagnetic honeycomb bilayer lattice
• Weakly coupled alternating $S=1/2$ chains in the distorted honeycomb lattice compound Na${}_2$Cu${}_2$TeO${}_6$
• Field-induced double dome and Bose-Einstein condensation in the crossing quantum spin chain system AgVOAsO4
• Anisotropic phase diagram of the frustrated spin dimer compound Ba3Mn2O8
• Magnon Supersolid and Anomalous Hysteresis in Spin Dimers on a Triangular Lattice
• Magnetic Fluctuations and the Spin-Orbit Interaction in Mott Insulating CoO
• Low-temperature heat transport of the layered spin-dimer compound Ba_3Mn_2O_8
• Heat capacity of the site-diluted spin dimer system Ba3(Mn1-xVx)2O8
• Exciton condensation in bilayer spin-orbit insulator
• Persistence of magnons in a site-diluted dimerized frustrated antiferromagnet
• Structural and magnetic properties in the quantum S=1/2 dimer systems Ba3(Cr1-xVx)2O8 with site disorder
• Unveiling a Family of Dimerized Quantum Magnets in Ternary Metal Borides
• Bose-Einstein condensation of semi-hard bosons in S=1 dimerized organic compound F2PNNNO
• The $S=1$ dimer system K${}_2$Ni(MoO${}_4$)${}_2$: a candidate for magnon Bose-Einstein condensation
• Two-triplon excitations of the Kitaev-Heisenberg-Bilayer