Calorimetric Study of Several Cuprates with Restricted Dimensionality.

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  • Yamaguchi Masaaki
    Institute for Solid State Physics, The University of Tokyo, Roppongi, Minato–ku, Tokyo 106
  • Ishikawa Masayasu
    Institute for Solid State Physics, The University of Tokyo, Roppongi, Minato–ku, Tokyo 106
  • Furuta Tomoki
    Institute for Solid State Physics, The University of Tokyo, Roppongi, Minato–ku, Tokyo 106

Bibliographic Information

Other Title
  • Calorimetric Study of Several Cuprates
Published
1996
DOI
  • 10.1143/jpsj.65.2998
Publisher
THE PHYSICAL SOCIETY OF JAPAN

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By means of specific heat and magnetic susceptibility measurements we investigated the magnetic compounds of various crystal structure, CuWO4, LiCuVO4, CuSb2O6, CuNb2O6 and CuBi2O4. All of these cuprates revealed strong one-dimensional (1D) correlations persisting up to very high temperatures which are well explained by the S=1/2 Heisenberg antiferromagnetic linear-chain model. At lower temperatures they showed various long-range magnetic ordering except for CuNb2O6. In particular, we observed a rather unusual transition at 2.4, K for LiCuVO4 which is conjectured to be a transition to the S=1/2 quadratic Ising antiferromagnet, thereby demonstrating a dimensional cross-over of correlations from 1D to 2D. The magnetic susceptibility and specific heat exhibit a critical point and a logarithmic divergence at 2.4, K, respectively, as predicted by theory. We herein report the experimental results and the preliminary analyses of these low-dimensional cuprates.

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