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

• Authors: S. Sveleba , O. Semotyuk , I. Katerynchuk , I. Kunyo , I. Karpa , Yu. Pankivskyi
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

61.44.Fw; 64.70.Rh; 78.20.Fm; 65.40.Ba

Discipline

• 61.44.Fw: Incommensurate crystals
• 78.20.Fm: Birefringence
• 64.70.Rh: Commensurate-incommensurate transitions
• 65.40.Ba: Heat capacity(for specific heat of magnetic materials, see 75.40.-s)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 114
• Issue: 4
• Pages: 791-806

Dates

published

2008-10

received

2007-11-14

(unknown)

2008-04-27

(unknown)

2008-05-08

Contributors

author

S. Sveleba

• Department of Nonlinear Optics, Lviv National Ivan Franko University, Tarnavskogo str. 107, Lviv, UA-79017, Ukraine

author

O. Semotyuk

• Department of Nonlinear Optics, Lviv National Ivan Franko University, Tarnavskogo str. 107, Lviv, UA-79017, Ukraine

author

I. Katerynchuk

• Department of Nonlinear Optics, Lviv National Ivan Franko University, Tarnavskogo str. 107, Lviv, UA-79017, Ukraine

author

I. Kunyo

• Department of Nonlinear Optics, Lviv National Ivan Franko University, Tarnavskogo str. 107, Lviv, UA-79017, Ukraine

author

I. Karpa

• Department of Nonlinear Optics, Lviv National Ivan Franko University, Tarnavskogo str. 107, Lviv, UA-79017, Ukraine

author

Yu. Pankivskyi

• Department of Ecology, Ukrainian National University of Forestry, O. Kobylyanskoyi str. 1, Lviv, UA-79005, Ukraine

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Identifiers

DOI

10.12693/APhysPolA.114.791