Thermodynamics and correlations of a helical spin chain with non-magnetic impurities

I. Harada, H. J. Mikeska

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2 Citations (Scopus)


The effect of non-magnetic impurities on the thermodynamics of a classical helimagnetic chain with antiferromagnetic nearest-neighbour interactions and next-nearest-neighbour interactions is studied by means of the transfer matrix method. The results for the partition function and the nearest-neighbour and the next-nearest-neighbour spin correlation functions are obtained exactly for both the isotropic Heisenberg model and the planar model as functions of temperature and concentration of non-magnetic impurities. The magnetic susceptibility is calculated up to terms linear in the concentration. It is found that a non-magnetic impurity modifies the helical spin structure in its vicinity and leads consequently to the formation of a new local equilibrium spin structure, which is called a spin complex. The consequences of this peculiar spin complex on the thermodynamics, especially on the spin correlation functions, are extensively discussed in connection with experimental results on FeMgBO 4.

Original languageEnglish
Article number015
Pages (from-to)953-967
Number of pages15
JournalJournal of Physics: Condensed Matter
Issue number4
Publication statusPublished - 1990

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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