Magnetic Phase Transitions in Rb_<1-x>K_xNiCl_3 System : A Mixture of Antiferromagnets on Deformed Triangular Lattice

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概要

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• The Rb_<1-x> K_x NiCl_3 system is a mixture of S=1 Heisenberg antiferromagnets on deformed triangular lattice with the easy-axis and easy-plane types of anisotropy. The magnetic phase transitions in the present system were investigated by susceptibility and torque measurements. A phase diagram for temperature vs x was determined. With increasing x the anisotropy changes from the easy-axis type to the easy-plane one at x_c=0.38. For x<x_c one phase transition occurs, while for x_c<x<0.8 two transitions take place. The intermediate phase appears at x_c where the anisotropy changes its sign, and the temperature range of the intermediate phase is enhanced on increasing x. The magnetic properties for x_c<x<0.8 are similar to those of RbVBr_3 which has a deformed triangular lattice in the c-plane. The successive transition was not observed in the vicinity of x=1 where the symmetry of the crystal lattice is lower than that for x<0.8.

• 社団法人日本物理学会の論文
• 1993-11-15

著者

• TANAKA Hidekazu

  Department of Natural History Sciences, Faculty of Science, Hokkaido University

• NAGATA Kazukiyo

  Department of Physics, Faculty of Engineering, Kanagawa University

• Hasegawa Toshiaki

  Department of Physics, Faculty of Science, Tokyo Institute of Technology

• 永田 一清

  Univ. Electro‐communications Tokyo

• Hasegawa T

  Ehime Univ. Ehime

• Hasegawa T

  Tokyo Inst. Technol. Yokohama

• Nagata Kazukiyo

  Department Of Physics Faculty Of Engineering Kanagawa University

• Nagata Kazukiyo

  Department Of Physics Tokyo Institute Of Technology

• Nagata Kazukiyo

  Department Of Physics College Of Science Tokyo Institute Of Technology

• Hasegawa T

  Department Of Physics Faculty Of Science Kyoto University

• Nagata Katsuaki

  Faculty Of Engineering Tamagawa Univ.

• Tanaka Hidekazu

  Department Of Internal Medicine Iii Osaka Medical College

• Hasegawa T

  Miyazaki Univ. Miyazaki Jpn

• Tanaka Hidekazu

  Department Of Earth And Planetary Sciences Faculty Of Science Tokyo Institute Of Technology

• Tanaka Hidekazu

  Department Of Chemistry And Chemical Biology Gunma University

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