Abstract
We have successfully synthesized Ba 3 Cr 2 O 8 and investigated its crystal structure and magnetic properties. The crystal structure consists of Ba 2 + cations and isolated CrO 4 3- tetrahedra; magnetic chromium ions exist as rare Cr 5 + (3 d 1 , S = 1/2). An S = 1/2 compound Ba 3 Cr 2 O 8 was found to be a three-dimensional quantum spin system with a singlet ground state of dimer origin. From the analysis of magnetic susceptibility and high-field magnetization data, excitation gap is evaluated as Δ/ k B = 16.1 K and intra- and interdimer exchange interactions are estimated as J 0 / k B = 25.0 K and J '/ k B = 7.7 K, respectively. Comparing with a similar spin dimer compound Ba 3 Mn 2 O 8 , Ba 3 Cr 2 O 8 has a more dominant intradimer interaction.
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