Magnetic excitations of the gapped quantum spin dimer antiferromagnet Sr${}_3$Cr${}_2$O${}_8$

Abstract

Sr${}_3$Cr${}_2$O${}_8$ consist of a lattice of spin-1/2 Cr${}^{5+}$ ions, which form hexagonal bilayers and which are paired into dimers by the dominant antiferromagnetic intrabilayer coupling. The dimers are coupled three-dimensionally by frustrated interdimer interactions. A structural distortion from hexagonal to monoclinic leads to orbital order and lifts the frustration giving rise to spatially anisotropic exchange interactions. We have grown large single crystals of Sr${}_3$Cr${}_2$O${}_8$ and have performed DC susceptibility, high field magnetisation and inelastic neutron scattering measurements. The neutron scattering experiments reveal three gapped and dispersive singlet to triplet modes arising from the three twinned domains that form below the transition thus confirming the picture of orbital ordering. The exchange interactions are extracted by comparing the data to a Random Phase Approximation model and the dimer coupling is found to be $J_0=5.55$ meV, while the ratio of interdimer to intradimer exchange constants is $J^{\prime }/J_0=0.64$. The results are compared to those for other gapped magnets.

13 pages, 14 figures

References in corpus (8)

• Field-induced Bose-Einstein Condensation of triplons up to 8 K in Sr3Cr2O8
• Bose-Einstein Condensation of Triplons in Ba3Cr2O8
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• Singlet-triplet dispersion reveals additional frustration in the triangular dimer compound Ba${}_3$Mn${}_2$O${}_8$
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• Magnetic field-induced phase transitions in a weakly coupled s = 1/2 quantum spin dimer system Ba${}_3$Cr${}_2$O${}_8$
• Weakly coupled $s=1/2$ quantum spin singlets in Ba${}_3$Cr${}_2$O${}_8$
• Dispersive magnetic excitations in the S=1 antiferromagnet Ba${}_3$Mn${}_2$O${}_8$

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