The variational cumulant expansion study of spatially anisotropie XY model

Hong Li, Tianlun Chen

Research output: Contribution to journalArticlepeer-review


With the variational-cumulant expansion (VCE) method, the critical temperature and spontaneous magnetization of the spatially anisotropic XY model are calculated up to the fourth order. The variational parameter is determined by the complete variational method and the results are compared with both the Monte Carlo results and the self-consistent harmonic approximation (SCHA) results. It is shown that the VCE method can give a better result than the SCHA method when the coupling between adjacent layers is small.

Original languageEnglish (US)
Pages (from-to)523-526
Number of pages4
JournalCommunications in Theoretical Physics
Issue number4
StatePublished - Dec 15 1998
Externally publishedYes


  • Critical temperature
  • Spontaneous magnetization
  • VCE

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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