Low Temperature Excitations in Low-Dimensional XY Ferromagnets CsNiF_3 end Graphite-CoCl_2

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概要

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• The characteristic temperattmre dependence of magnetic lteat capacities C-of XY ferromagnetic spin systems in one and two dimensions has been observedin CsNiF. and graphite-Coal, respectively. The value of (l'.. of CsNiF3 hasbeen shown to depend linearly on temperature T at low temperatures, and re-produced by the theoretical values for an XY ferromagnetic chain with thereported value of exchange constant J/k.:11.8 K and witlt spin value .5:1.While, in the Coal. compound C- has been found to obey C-cm(J)T' whichagrees with the spin wave theory for an XY ferromagnet in two dimensions withJ/k.w9.7K. The thermal behaviour of these compounds reflects magneticexcitations intrinsic to the XY system, making a typical contrast with the case forthe Heisenberg system.

• 社団法人日本物理学会の論文
• 1985-08-15

著者

• MURAKAMI Youichi

  Department of Physics, Tohoku University

• TAKEDA Kazuyoshi

  Department of Applied Quantum Physics, Kyushu University

• Amaya Kiichi

  Department of Material Physics, Faculty of Engineering Science, Osaka University

• Murakami Youichi

  Department Of Aerospace Engineering College Of Engineering Osaka Prefecture University

• Murakami Youichi

  Department Of Material Physics Faculty Of Engineering Science Osaka University

• Amaya Kiichi

  Department Of Material Physics Faculty Of Engineering Science

• Takeda Kazuyoshi

  Department Of Applied Quantum Physics Faculty Of Engineering Kyushu University:institute Of Environm

• Takeda Kazuyoshi

  Department Of Material Physics Faculty Of Engineering Science Osaka University:department Of Applied Science Faculty Of Engineering Kyushu University

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