Hasan Hamit Yurtseven

E-mail

hamit@metu.edu.tr

Department

Department of Physics

ORCID

0000-0002-7745-6490

Scopus Author ID

9334413200

Web of Science Researcher ID

ABA-9994-2020

Landau phenomenological model for the alpha-INC (incommensurate)-beta transition in quartz Yurtseven, Hasan Hamit; Ates, Simge (2021-08-01) The temperature dependence of the order parameters eta (alpha-phase) and xi (INC - incommensurate phase) are calculated in the presence of the electric field for the alpha-INC-beta transition in quartz by the Landau mean f...
Investigation of vibrational, elastic and dielectric properties of cubic gauche nitrogen (cg-N) Akay, Ö.; Yurtseven, Hasan Hamit (2021-06-01) © 2021 Elsevier GmbHVibrational, elastic and dielectric properties of the cubic gauche nitrogen (cg-N) are investigated by analyzing the Raman optic and zone-center phonon modes using the literature data. From the pressure...
Calculation of the damping constant and the relaxation time of the LA mode in the incommensurate phase of quartz Ates, S.; Yurtseven, Hasan Hamit (2021-04-01) The damping constant (linewidth) of the LA mode is calculated as a function of temperature for the incommensurate (INC) phase of quartz by using the models of the pseudospin-phonon (PS) coupled and the energy fluctuation (...
Phenomenological approaches on the Nd3+ doped ferroelectric LaBGeO5 Kara, N.; Kiraci, A.; Yurtseven, Hasan Hamit (2021-02-01) Two phenomenological models, namely the compressible Ising model and Landau model, have been used to analyze the specific heat and the dielectric constant data, respectively for the pure and Nd3+ doped LaBGeO5 (LBG) crysta...
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; Akay, O. (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 d...
Temperature dependence of the piezoelectric resonance frequency in relation to the anomalous strain near the incommensurate phase of quartz Ates, S.; Yurtseven, Hasan Hamit (2021-01-01) The temperature dependence of the piezoelectric resonance frequency is analyzed by the power-law formula in the vicinity of the critical temperature of the incommensurate (INC) phase in quartz using the experimental data f...
Analysis of the IR-Raman Modes and the Heat Capacity Near the α-Inc-β Transitions in Quartz Yurtseven, Hasan Hamit; Günay, E.; Karacali, H.; Ateş, S. (2021-01-01) © 2021 Taylor & Francis Group, LLC.This study gives our analysis for the temperature dependence of the infrared frequency and the integrated intensity of the 695 cm−1 mode near the α–β transition at 847.5 K and the tempera...
Thermodynamic study on the magnetic transition and structural phase transition in [(CH3)(2)NH2][Na0.5Fe0.5(HCOO)(3)] by using the Landau phenomenological model Yurtseven, Hasan Hamit; Tari, O. (AIP Publishing, 2020-11-01) In this study, we apply the Landau phenomenological model to describe magnetic transition and structural phase transition in a metal formate framework (MOF) of the ferromagnetic [(CH3)(2)NH2][Na0:5Fe0:5(HCOO)(3)], namely, ...
Raman bandwidths calculated for the librational ( a -phase) and internal (8, d loc and d phases) modes in solid N 2 using pseudospin-phonon coupling (PS) and energy-fluctuation (EF) models Yurtseven, Hasan Hamit; Akay, O. (Elsevier BV, 2020-10-01) This study gives the calculation of the Raman bandwidths using the models of the pseudospin-phonon coupling (PS) and energy fluctuation (EF) where the Raman frequency calculated from the molecular field theory, is consider...
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...

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