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Phase Transitions in [N(CH_3)_4]_2ZnCl_4 and [N(CH_3)_4]_2CuCl_4 Crystals Related with the Incommensurate Modulation Existence

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Sveleba S., Semotyuk O., Katerynchuk I., Kunyo I., Karpa I., Pankivskyi Y.

Acta Physica Polonica A

2008

vol. 114

issue 4

791-806

The continuous phase transitions are observed in the crystals with incommensurate phase. They are transitions of parent-incommensurate phases (T_i); transitions between metastable states; incommensurate-commensurate phases (T_c). It was set that phase transition between parent and incommensurate phase is a continuous second-order phase transition with a critical index β = 0.5. The transition between metastable states is a continuous phase transition through the intermediate temperature region - incommensurate phase. The wave vector changes with the temperature here and wave vectorwe q* = q₁ - q₂ appears, where q₁, q₂ denote commensurate values of incommensurability wave vector of neighboring metastable states. It was shown that the phase transition between incommensurate and commensurate phases is a continuous phase transition.

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1 Acta Physica Polonica A

1 2008

1 Karpa I.

1 Katerynchuk I.

1 Kunyo I.

1 Pankivskyi Y.

1 Semotyuk O.

1 Sveleba S.

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Phase Transitions in [N(CH_3)_4]_2ZnCl_4 and [N(CH_3)_4]_2CuCl_4 Crystals Related with the Incommensurate Modulation Existence