Fluctuation-Induced Magnetic Order of RbFeCl_3 in a Magnetic Field : Condensed Matter: Electronic Properties, etc.
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概要
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Mean-field theory is insufficient to explain the magnetic order of RbFeCl_3 in a magnetic field applied in the c plane. Specifically, quantum and thermal fluctuations induce magnetic structures which do not otherwise appear, as found also for CsCuCl_3. We derive microscopically an expression for the free energy which describes both kinds of fluctuations on an equal basis. Our result includes mean-field theory, but goes beyond it to include terms which lift the nontrivial degeneracy. In addition to the modified 120゜ structure at low fields and the aligned state at high fields, we find an up-up-down-type collinear structure and a coplanar structure at intermediate fields. Our theory explains qualitatively experimental results at low temperatures, but detailed confirmation requires further experiments including the neutron scattering.
- 社団法人日本物理学会の論文
- 2000-05-15
著者
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SHIBA Hiroyuki
Department of Physics, Kobe University
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NIKUNI Tetsuro
Department of Physics, Faculty of Science, Tokyo University of Science
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Shiba Hiroyuki
Department Of Physics Kobe University
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Jacobs A
Department Of Physics University Of Toronto
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Nikuni Tetsuro
Department Of Physics Faculty Of Science Tokyo University Of Science
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JACOBS Allan
Department of Physics, University of Toronto
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Jacobs E.
Department Of Physics Tokyo Institute Of Technology
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Jacobs Allan
Department Of Physics University Of Toronto
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Shiba Hiroyuki
Department Of Computer Science Gunma University Faculty Of Engineering
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