New Effect in Incommensurate Phase of X-Ray-Irradiated {N(CH<sub>3</sub>)<sub>4</sub>}<sub>2</sub>CuCl<sub>4</sub> and {N(CH<sub>3</sub>)<sub>4</sub>}<sub>2</sub>ZnCl<sub>4</sub> Crystals
V. B. Kapustianik; I. I. Polovinko; S. A. Sveleba; O. G. Vlokh; V. S. Zhmurko; V. B. Kapustianik; Lviv Franko University - vul. Lomonosova 8, Lviv 290005, Ukraine; I. I. Polovinko; Lviv Franko University - vul. Lomonosova 8, Lviv 290005, Ukraine; S. A. Sveleba; Lviv Franko University - vul. Lomonosova 8, Lviv 290005, Ukraine; O. G. Vlokh; Lviv Franko University - vul. Lomonosova 8, Lviv 290005, Ukraine; V. S. Zhmurko; Lviv Franko University - vul. Lomonosova 8, Lviv 290005, Ukraine
Журнал:
EPL (Europhysics Letters)
Дата:
1992-07-01
Аннотация:
Using Senarmont's method (λ = 633 nm), the x-ray defect concentration gradient influence on the properties of {N(CH<sub>3</sub>)<sub>4</sub>}<sub>2</sub>ZnCl<sub>4</sub> and {N(CH<sub>3</sub>)<sub>4</sub>}<sub>2</sub>CuCl<sub>4</sub> crystals incommensurate (IC) phase was investigated. Long-periodical anomalies were observed on the δ(Δn)<sub>c</sub> = f(T) dependences for the case when the defect concentration gradient was created along the modulation axis, coinciding with a direction of light propagation. The nature of these anomalies was connected with the interaction of a modulated structure with gradiently distributed defects.
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