The Stochastic Mode of the Modulated Structure in [N(CH3)4]2MeCl4 Dielectric Crystals

S. Svelebaa, O. Semotyuka, I. Katerynchuka, Yu. Furgalaa and Yu. Pankivskyib aDepartment of Nonlinear Optics, Lviv National Ivan Franko University, Tarnavskogo st. 107, Lviv, 79008, Ukraine bDepartment of Ecology, Ukrainian National University of Forestry, O. Kobylyanskoyi st. 1, Lviv, 79005, Ukraine

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Received: 02 09 2005; revised version: 02 02 2006; in final form: 06 04 2006;

Temperature behavior of the optical birefringence in the transitional regions of the incommensurate phase of [N(CH3)]CuCl4 was studied. Temperature dependencies of the modulated structure wave vector and of the specific heat in these regions were analyzed. The stochastic mode of the incommensurate modulated structure in [N(CH3)]MeCl4 (Me = Cu, Fe) dielectric crystals was discovered.

DOI: 10.12693/APhysPolA.109.695 PACS numbers: 42.25.Lc, 61.44.Fw, 64.70.Rh, 78.20.Fm