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Calculation of the Raman Frequency and Linewidth of Vibrons using Unharmonic Self Energy Model for the ε, δloc and δ phases in solid Nitrogen
Date
2018-12-21
Author
Akay, Özge
Yurtseven, Hasan Hamit
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URI
https://hdl.handle.net/11511/72542
Conference Name
24. Yoğun Madde Fiziği Toplantısı, Ankara, Türkiye, (21 Aralık 2018)
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Department of Physics, Conference / Seminar
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Calculation of the Raman frequency and linewidth of vibrons using anharmonic self energy model for the ε, δloc and δ phases in solid nitrogen
Akay, Ö.; Yurtseven, Hasan Hamit (Elsevier BV, 2020-10-01)
Temperature dependences of the Raman frequency shifts and linewidths of vibrons ν1, ν2 and ν22 are calculated from the anharmonic self energy in the ε, δloc (localized δ) and δ phases of solid nitrogen (P = 18.5 GPa). This is performed by fitting the expressions from the the anharmonic self energy to the experimental frequency and FWHM data for those vibrons from the literature. Our results show that the anharmonic self energy model can explain adequately the observed behavior of the Raman frequency and lin...
Calculation of the tilt angle and susceptibility for the alpha-beta transition in quartz using a mean field model
Yurtseven, Hasan Hamit; Ates, S. (World Scientific Pub Co Pte Lt, 2017-03-30)
Tilt angle (order parameter) and the susceptibility are calculated as a function of temperature for the alpha-beta transition in quartz using a Landau phenomenological model. The tilt angle as obtained from the model is fitted to the experimental data from the literature and the temperature dependence of the tilt angle susceptibility is predicted close to the alpha-beta transition in quartz. Our results show that the mean field model explains the observed behavior of the alpha-beta phase transition in quart...
Calculation of the inverse relaxation time and the activation energy as a function of temperature for the Raman modes close to the phase transitions in solid nitrogen
Yurtseven, Hasan Hamit (Elsevier BV, 2021-02-01)
The inverse relaxation time is calculated as a function of temperature for the transitions of alpha - beta (P = 0) and epsilon-delta(loc)-delta (at constant pressures) in the solid N-2. For this calculation, the observed data from the literature are used for the Raman frequency shifts and linewidths (FWHM) of the librational E-g mode (alpha - beta) and the internal modes of v(1) and v(2) (epsilon-delta(loc)-delta) in the nitrogen. From the temperature dependence of the inverse relaxation time, the activatio...
Calculation of the Dielectric Constant as a Function of Temperature Close to the Smectic A-Smectic B Transition in B5 Using the Mean Field Model
Yurtseven, Hasan Hamit (2012-01-01)
The temperature dependence of the static dielectric constant (epsilon) is calculated close to the smectic A-smectic B (S-A-S-B) transition (T-c = 71.3 degrees C) for the liquid crystal compound B5. By expanding the free energy in terms of the order parameter in the mean field theory, the expression for the dielectric susceptibility (dielectric constant) is derived and is fitted to the experimental data for epsilon which was obtained at the field strengths of 0 and 67 kV/cm from literature. Coefficients in t...
Calculation of the P-T phase diagram of nitrogen using a mean field model
Enginer, Y.; Algul, G.; Yurtseven, Hasan Hamit (2017-12-20)
The P-T phase diagram is calculated at low and moderate pressures by obtaining the phase line equations for the transitions considered in nitrogen using the Landau phenomenological model. For some transitions, a quadratic coupling between the order parameters is taken into account in the expansion of free energies in terms of the order parameters. A quadratic function in T and P is fitted to the experimental P-T data from the literature and the fitted parameters are determined.
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Ö. Akay and H. H. Yurtseven, “Calculation of the Raman Frequency and Linewidth of Vibrons using Unharmonic Self Energy Model for the ε, δloc and δ phases in solid Nitrogen,” presented at the 24. Yoğun Madde Fiziği Toplantısı, Ankara, Türkiye, (21 Aralık 2018), Ankara, Türkiye, 2018, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/72542.