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Birefringence study of the Potts model phase transition in NaN

Journal of Physics C: Solid State Physics, ISSN: 0022-3719, Vol: 16, Issue: 31, Page: L1103-L1108
1983
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  • Citations
    3
    • Citation Indexes
      3

Article Description

Observations on single-crystal NaN with a polarising microscope revealed the existence of three kinds of ferroelastic domains below the alpha - beta phase transition point (T=19.8 degrees C), which is consistent with the reported symmetry change. Temperature dependence of the order parameter of this three-state Potts model transition was determined from the measurement of spontaneous birefringence. A small jump of the order parameter was found at T, which shows that this phase transition is weakly first-order. This result is consistent with the symmetry argument and the breakdown of the Landau's 'third-order-invariant condition' does not occur in this crystal.

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