Specific heat study of the complex phase transitions in magnetism and dielectricity on triangular lattice antiferromagnets |
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| Authors: | Yamanaka K Nishiwaki Y Iio K Kato T Mitsui T Tojo T Atake T |
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| Institution: | (1) Department of Physics (Cond. Mat. Phys.), Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan;(2) Department of Physics, Faculty of Education, Chiba University, Yayoi-cho Inage-ku, Chiba 263-8552, Japan;(3) Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan |
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| Abstract: | The complex phase transitions involving dielectricity and magnetism on distorted triangular lattice antiferromagnets, "KNiCl3-family" crystals, which have the crystal structures derived from the prototype CsNiCl3, were studied through the heat capacity measurements. These crystals are classified into characteristic three groups from
the viewpoint of magnetic and structural properties clarified so far. The results of the dielectric constant measurement as
a function of temperature are also presented in detail. The present calorimetric study reveaed that the structural successive
phase transitions rather than the magnetic transitions in these crystals are recognized more distinctly as the presence of
specific heat anomalies at the respective phase transition points.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | spin frustration complex phase transition distorted triangular lattice antiferromagnet heat capacity measurement |
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