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

References in corpus (7)

• Dimensional reduction at a quantum critical point
• Nature of the spin dynamics and 1/3 magnetization plateau in azurite
• Geometric Frustration and Dimensional Reduction at a Quantum Critical Point
• Field-driven phase transitions in a quasi-two-dimensional quantum antiferromagnet
• Emergent Symmetry and Dimensional Reduction at a Quantum Critical Point
• Dispersive magnetic excitations in the S=1 antiferromagnet Ba${}_3$Mn${}_2$O${}_8$
• Dynamics of the Distorted Diamond Chain

Cited by in corpus (3)

• Asymmetric quintuplet condensation in the frustrated S=1 spin dimer compound Ba3Mn2O8
• Ordered magnetic phases of the frustrated spin-dimer compound Ba3Mn2O8
• Weakly coupled $s=1/2$ quantum spin singlets in Ba${}_3$Cr${}_2$O${}_8$