Interaction of the incommensurate structure with defects in crystals of (N(CH3)4)2BCl4 (B = Zn, Cu, Mn) and (NH2(CH3)2)2CuCl4

Polovinko, I. I.; Sveleba, S. A.; Kapustianik, V.; Zhmurko, V. S.

doi:10.1002/pssa.2211310137

Cited by 12 publications

(14 citation statements)

References 4 publications

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“…The temperature intervals of anomalies existence for x-and y-directions are equal tõ 0.35 K and 0.20 K for z-direction. The obtained data concerning the anomalous behaviour of δ(Δn) are analogous to formerly observed one for these [Ν(CΗ3)4]2CuCl4 crystals [22]. The difference in the anomalous behaviour of δ(Δn) between x-, y-and z-directions is obviously comprised with availability of the incommensurate modulation along the z-axis.…”

Section: Experiments and Discussionsupporting

confidence: 82%

Behaviour of the Optical Birefringence in Conditions of the "Viscous" Interaction

2000

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Section: Experiments and Discussionsupporting

confidence: 82%

Behaviour of the Optical Birefringence in Conditions of the "Viscous" Interaction

2000

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“…The incommensurate phases are characterized by specific effects, such as global thermal hysteresis, "parallelogram" and "dielectric memory" cycles, and thermal memory [4,8]. The thermal-memory effect can manifest itself as a change in the thermooptical parameters of a crystal, e.g., birefringence, or in its absorption spectra [4,8].…”

Section: Introductionmentioning

confidence: 99%

“…The thermal-memory effect can manifest itself as a change in the thermooptical parameters of a crystal, e.g., birefringence, or in its absorption spectra [4,8]. To detect the thermooptical-memory effect, it is necessary to hold a sample at a stable temperature for several hours.…”

Section: Introductionmentioning

confidence: 99%

“…The temperatures of phase transitions (K) and the symmetry of (N(CH 3 ) 4 ) 2 CuCl 4 crystals [1][2][3]7] in different phases can be represented in the following form ( 4 ] 2− tetrahedron in the initial phase is significantly distorted and has a D 2d symmetry. The incommensurate-modulation phase II is characterized by the modulation-wave vector q δ = (1 ⁄ 3 − δ)c * [7].…”

Section: Introductionmentioning

confidence: 99%

“…The scientific interest shown in these crystals is explained by the fact that they can be considered as model crystals with incommensurate modulation. Moreover, TMA-CuCl 4 crystals can experience complex phase transitions [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Manifestations of Phase Transitions and the Thermooptical-Memory Effect in the Absorption Spectra of (N(CH3)4)2CuCl4 Crystals

2005

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The manifestations of phase transitions and the spatial modulation of the structure of the (N(CH 3 ) 4 ) 2 CuCl 4 crystal in its absorption spectra have been investigated. It has been established that the thermooptical-memory effect manifesting itself in the absorption spectra of this crystal entirely corresponds to the model of ordering of defects and impurities in a sample with a modulated structure. It is shown that, as a result of stabilization of the crystal studied in the incommensurate phase, its symmetry and the symmetry of the metal-halogen complex in it lower depending on the defect wave. This manifests itself as a marked shift of the intraionic-absorption bands and an increase in their intensity.

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Peculiarities of the Piezooptic Effect in Incommensurate Crystals

Sveleba

Polovinko

Bublyk

et al. 1995

Physica Status Solidi (b)

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The influence of uniaxial mechanical stress on the modulated structure which consists of a superstructure sequence is investigated in [N(CH3),],MeCl, (Me = Cu, Fe, Zn) crystals. The peculiarities of the effective piezooptic coefficients n : within the incommensurate phase of these crystals are studied by Senarmont's method. The influence of uniaxial mechanical stress disturbs the conditions of modulated structure interaction with defects what leads to the appearance of the widening of metastable states and to anomalies in the physical characteristics. It causes the change of the region of the localization of the incommensurability wave vector k on the commensurate values of higher order. IntroductionThe authors of [l to 31 have drawn the conclusion that anomalies of the effective piezooptic coefficients zi"j within the incommensurate (IC) phase are connected with peculiarities of the order parameter and the behaviour of the elastic constants Cij. Anomalies observed in the vicinity of phase transitions were explained by the influence of the term a@/&, proportional to the value aT,laaj, i.e. to the shift of the transition temperature under the influence of uniaxial stress. According to [4] the displacement of the anomaly corresponding to the thermooptical memory effect under the influence of mechanical stresses cj cannot be explained only by the temperature shift of the phase transition at T,. It is necessary to take into account soliton density changes under the action of mechanical stresses o? Besides, the deformation of the soliton structure (the change of the regular distribution along the crystal sample) may proceed in this case, as has been shown theoretically [5]. The experimental confirmation of this fact has been reported in [6]. Besides, the displacement of the ') Kyrylo and Methodiy str. 8, UA-290005 Lviv, Ukraine. , ) Lesna str. 16, PL-25509 Kielce, Poland. 15*

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Interaction of the incommensurate structure with defects in crystals of (N(CH3)4)2BCl4 (B = Zn, Cu, Mn) and (NH2(CH3)2)2CuCl4

Cited by 12 publications

References 4 publications

Behaviour of the Optical Birefringence in Conditions of the "Viscous" Interaction

Behaviour of the Optical Birefringence in Conditions of the "Viscous" Interaction

Manifestations of Phase Transitions and the Thermooptical-Memory Effect in the Absorption Spectra of (N(CH3)4)2CuCl4 Crystals

Peculiarities of the Piezooptic Effect in Incommensurate Crystals

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