Singlet Ground State and Magnetic Interactions in New Spin Dimer System Ba_3Cr_2O_8(Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We have successfully synthesized Ba_3Cr_2O_8 and investigated its crystal structure and magnetic properties. The crystal structure consists of Ba^<2+> cations and isolated CrO^<3->_4 tetrahedra; magnetic chromium ions exist as rare Cr^<5+> (3d^1, S=1/2). An S=1/2 compound Ba_3Cr_2O_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=16.1K and intra- and interdimer exchange interactions are estimated as J_0/k_B=25.0K and J'/k_B=7.7K, respectively. Comparing with a similar spin dimer compound Ba_3Mn_2O_8, Ba_3Cr_2O_8 has a more dominant intradimer interaction.
- 社団法人日本物理学会の論文
- 2006-05-15
著者
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UEDA Yutaka
Material Design and Characterization Laboratory,Institute for Solid State Physics,The University of
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Ueda Yutaka
Materials Design And Characterization Laboratory Institute For Solid State Physics University Of Tok
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Nakajima Tomohiko
Materials Design And Characterization Laboratory Institute For Solid State Physics University Of Tok
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Nakajima Tomohiko
Materials Design And Characterization Laboratory Institute For Solid State Physics The University Of
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Mitamura Hiroyuki
Division Of Physics Under Extreme Conditions Institute For Solid State Physics University Of Tokyo
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MITAMURA Hiroyuki
Division of Physics under Extreme Conditions, Institute for Solid State Physics, University of Tokyo
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UEDA Yutaka
Material Design and Characterization Laboratory, Institute for Solid StatePhysics, University of Tokyo
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UEDA Yutaka
Materials Design and Characterization Laboratory, Institute for Solid State Physics, University of Tokyo
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Ueda Yutaka
Material Design and Characterization Laboratory, Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581
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