Novel Phase Transition in Spin-1/2 Linear Chain Systems : NaTiSi_2O_6 and LiTiSi_2O_6
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概要
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We synthesized a well-characterized powder sample of NaTiSi_2 O_6, which had been missing as a spin-1/2 compound in one-dimensional (1D) magnets of the pyroxene family, and measured the magnetic susceptibility, lattice parameters and specific heat as functions of temperature. We observed a typical behavior of magnetic susceptibility in a spin-1/2 1D magnet, followed by a spin-Peierls-like transition at 210 K. The most significant feature of the transition is that it occurs at a temperature higher than that at the maximum point of the Bonner-Fisher curve. This means that the short-range magnetic correlations within the chain are not fully developed and intrinsic magnetoelastic instability of a 1D system cannot be considered as a driving force for the transition. We propose an important role of the orbital degree of freedom, that is, the orbital order, based on the structural feature that the 1D chain is made up of skew edge-sharing Ti^<3+>O_6 octahedra. A similar transition was observed at 230 K in LiTiSi_2O_6.
- 社団法人日本物理学会の論文
- 2002-06-15
著者
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ISOBE Masahiko
Material Design and Characterization Laboratory,Institute for Solid State Physics,The University of
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UEDA Yutaka
Material Design and Characterization Laboratory,Institute for Solid State Physics,The University of
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NINOMIYA Emi
Graduate School of Science and Technology, Chiba University
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Isobe M
Materials Design And Characterization Laboratory Institute For Solid State Physics University Of Tok
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Isobe Masahiko
Materials Design And Characterization Laboratory Institute For Solid State Physics The University Of
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Isobe Masahiko
Institute For Materials Research Tohoku University
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NINOMIYA Emi
Department of Physics, Faculty of Science, Chiba University
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Isobe M
Department Of Physics Nagoya University
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Ninomiya Emi
Graduate School Of Science And Technology Chiba University
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Isobe Masahiko
Issp. The University Of Tokyo
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Isobe Masato
National Institute for Materials Science (NIMS)
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Isobe Masahiko
Material Design and Characterization Laboratory, Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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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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