Birefringence of Cu2ZnSiSe4 single crystals

Syrbu Nicolae; Zalamai Victor; Guk Maxim; Levcenko Sergiu; Dorogan Andrei; Arushanov Ernest

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SYRBU, Nicolae, ZALAMAI, Victor, GUK, Maxim, LEVCENKO, Sergiu, DOROGAN, Andrei, ARUSHANOV, Ernest. Birefringence of Cu2ZnSiSe4 single crystals. In: Journal of Alloys and Compounds, 2015, vol. 635, pp. 188-193. ISSN 0925-8388. DOI: https://doi.org/10.1016/j.jallcom.2015.02.100

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Journal of Alloys and Compounds

Volumul 635 / 2015 / ISSN 0925-8388

Birefringence of Cu₂ZnSiSe₄ single crystals

DOI:https://doi.org/10.1016/j.jallcom.2015.02.100

Pag. 188-193

Syrbu Nicolae¹, Zalamai Victor¹², Guk Maxim², Levcenko Sergiu³, Dorogan Andrei¹, Arushanov Ernest²

¹ Technical University of Moldova,
² Institute of Applied Physics, Academy of Sciences of Moldova,
³ Helmholtz-Centre Berlin for Materials and Energy

Disponibil în IBN: 5 mai 2023

Rezumat

In Cu₂ZnSiSe₄ single crystals an interference spectra of the Fabry-Perot type due to observed birefringence were studied and spectral dependence of the refractive index n_∥ (E ∥ c) and n_⊥ (E ⊥ c), which intersect at isotropic wavelength λ₀ = 622 nm (300 K) and 605 nm (10 K) were defined. The spectral dependence of Δn = n_⊥-n_∥ in the short-wave and long-wave side of the wavelength λ₀ was determined. It was found that when λ > λ₀ Δn is negative and when λ < λ₀ Δn is positive. Wavelength λ₀ shifts as the temperature decreases toward shorter wavelengths. Phases of the n_∥ and n_⊥ light waves in λ > λ₀ and λ < λ₀ are different. At a wavelength of 538 nm (10 K) Δn has a maximum. Absorption coefficient in the fringes varies up to 10²-10³ times.

Cuvinte-cheie
Birefringence, Cu2ZnSiSe4, Fabry-Perot interference, Isotropic wavelength, Single crystal

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