Phase Diagram of the Square-Lattice ANNNI Model
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概要
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The phase diagram of the square-lattice ANNNI (axial next nearest-neighborIsing) model in an external field is calculated by the interface method of Miller-Hartmann and Zittartz. In the ANNNI model, next nearest-neighbor interactionsare assumed to be antiferromagnetic whereas others take both ferromagnetic andantiferromagnetic values. The stability of various commensurate phases predictedfor the ground state are examined against the formation of an interface separatingtwo different regions, each consisting of one of the degenerate ground states.The phase diagrams display different commensurate phases having no commonboundary between them so that the critical temperature is zero on'the multiphaseboundaries. For a certain set of parameters, the phase diagram is favorablycompared with the Monte Carlo result obtained by Rujan and co-workers.
- 社団法人日本物理学会の論文
- 1985-06-15
著者
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Harada Isao
Department Of Physics Faculty Of Science Kobe University
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Takasaki Koichi
Graduate School Of Science And Technology Kobe University
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