Theory of Magnetic Structures of CsCuCl_3 in Transverse Magnetic Field
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概要
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At zero field CsCuCl_3 is known to form a helical spin structure along the c-axis and the 120° structure in the c-plane. This paper discusses theoretically the effect of a magnetic field applied perpendicular to the c-axis, which breaks the axial symmetry. First the classical ground state is studied. The transverse magnetic field deforms the helical spin structure and causes a continuous phase transition from the helical (i.e. incommensurate) spin structure to a commensurate state, as the field increases. Detailed studies are made of the helix pitch and of the nature of the incommensurate spin structure as functions of the field. The commensurate state has a nontrivial degeneracy, which is lifted by quantum (and thermal) fluctuations. Therefore the 1/S expansion is applied to determine the spin structure of the commensurate state. From these studies possible spin structures are suggested for each region of field strength.
- 社団法人日本物理学会の論文
- 1993-11-15
著者
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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 T
Tokyo Inst. Technol. Tokyo
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Nikuni Tetsuro
Department Of Physics Faculty Of Science Tokyo University Of Science
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Nikuni Tetsuro
Department Of Physics Tokyo Institute Of Technology
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Sato Hideyuki
Graduate School Of Science Tokyo Metropolitan University
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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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