Magnetic order and exchange couplings in the frustrated diamond lattice antiferromagnet MnSc${}_2$Se${}_4$

Abstract

We report the magnetic properties of $A$-site spinel compound MnSc${}_2$Se${}_4$. The macroscopic magnetic measurements uncovers successive magnetic transitions at $T_{N1}$= 2.04 K, followed by two further transitions at $T_{N2}$=1.8 K and $T_{N3}$=1.6 K. Neutron powder diffraction reveals that both, $T_{N2}<T<T_{N1}$ and $T<T_{N3}$, orders are associated with the propagation vector $k$=(3/4 3/4 0), while the magnetic structures are collinear amplitude modulated and helical, respectively. Using neutron powder spectroscopy we demonstrated the effect of substitution of S by Se on the magnetic exchange. The energy range of the spin-wave excitations is supressed due to the chemical pressure of the $X$- ion in MnSc${}_2{X}_4$ ($X$=S, Se) spinels.

arXiv commentAccepted in Phys. Rev. B

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• Electronic structure of the frustrated diamond lattice magnet NiRh${}_2$O${}_4$
• Magnon-phonon interactions in the spinel compound MnSc${}_2$Se${}_4$
• Inter-Cation Charge Transfer Mediated Antiferromagnetism in Co${}_{1+x}$Ir${}_{2-x}$S${}_4$
• Contrasting magnetic behavior in MnSc_2X_4 (X = S, Se) spinel compounds investigated by magnetoelastic studies
• Codimension-Two Spiral Spin-Liquid in the Effective Honeycomb-Lattice Compound Cs${}_3$Fe${}_2$Cl${}_9$