Singlet Ground State and Magnetic Interactions in New Spin Dimer System Ba3Cr2O8

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  • Nakajima Tomohiko
    Materials Design and Characterization Laboratory, Institute for Solid State Physics, University of Tokyo
  • Mitamura Hiroyuki
    Division of Physics under Extreme Conditions, Institute for Solid State Physics, University of Tokyo
  • Ueda Yutaka
    Materials Design and Characterization Laboratory, Institute for Solid State Physics, University of Tokyo

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  • Singlet Ground State and Magnetic Interactions in New Spin Dimer System Ba<sub>3</sub>Cr<sub>2</sub>O<sub>8</sub>

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We have successfully synthesized Ba3Cr2O8 and investigated its crystal structure and magnetic properties. The crystal structure consists of Ba2+ cations and isolated CrO43− tetrahedra; magnetic chromium ions exist as rare Cr5+ (3d1, S=1⁄2). An S=1⁄2 compound Ba3Cr2O8 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⁄kB=16.1 K and intra- and interdimer exchange interactions are estimated as J0⁄kB=25.0 K and J′⁄kB=7.7 K, respectively. Comparing with a similar spin dimer compound Ba3Mn2O8, Ba3Cr2O8 has a more dominant intradimer interaction.

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