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Images on the front covers of AJP Fizika the issues were created by color processing in a graphic editor of photographs in previously published in articles of journal.

HONORARY EDITORS

EDITORS-IN-CHIEF

SENIOR EDITOR

Arif PASHAYEV

Nazim MAMEDOV, Chingiz QAJAR

Talat MEHDIYEV

Received Articles

THE INFLUENCE OF VARIOUS PHYSICAL PROCESSES ON THE CHARGE STATE OF POLYMERS

H.S. ALIYEV

Studying the polymer charge states, we make sure that charge state, especially electret properties and polarization efficiency can be improved at corona discharges or at influence of above mentioned factors together with electro-thermo-polarization.

AJP Fizika  September 10, 2019

PROBLEMS OF SILICON NANOELECTRONICS AND WAYS OF THEIR SOLUTION

E.A. KERIMOV, S.N. MUSAEVA

There are many problems with size reduction of silicon field MDS transistors, especially in the case of minimum dimension of channel length from 45 nm. The quantum-mechanical tunnel current is observed through thin layer of silicon dioxide under gate. We need to carry out the detail control of quantity and distribution of impurity atoms in channel region and also in source and sink regions in order to achieve the necessary high values of current relation of switched on and switched off transistor states.

AJP Fizika October 24, 2019

DETERMINATION OF CONFORMATION AND DIMENSIONS OF POLYETHYLENE GLYCOL MACROMOLECULE IN THE SYSTEMS WATER-POLYETHYLENE GLYCOL-KCl BY VISCOSIMETER METHOD

B.G. PASHAYEV 

The kinematic viscosity of water-polyethylene glycol-KCl systems at temperature 293.15 K and 0-0.05 molar part of KCl, and at a concentration range of 0-5 g/dl of polyethylene glycol are investigated. The polyethylene glycol fractions with molecular weights (1000, 1500, 3000, 4000 and 6000) are considered. The intrinsic viscosity of the investigated solutions, Haggins constant, α parameter in Mark-Kuhn-Houwink equation, swell coefficient of polyethylene glycol macromolecules, intrinsic viscosity in θ-solvent, PEG root-mean-square distance in solution and θ-solvent, the length of the Kuhn segment of θ-solvent and in the solution are calculated on the base of experimental data on kinematic viscosity at given KCl concentration. It is established that macromolecular ball of polyethylene glycol is permeable for surrounding liquid (water - KCl) and ball volume decreases and flexibility increases with KCl concentration increasing.

AJP Fizika  December 02, 2019

LOCAL STRUCTURE AND OPTICAL PROPERTIES OF Se - Sb CHALCOGENIDE

GLASSY SEMICONDUCTOR SYSTEM

R.F. SADIKHLI, M.E. KHALIGZADEH 

The local structure and optical properties of ChSS Se-Sb layers are studied by X-ray diffraction, Raman scattering and optical transmission spectra. The geometric sizes of medium order area and the “quasi-period” of fluctuation density in the given regions, the optical width of forbidden band and also the chemical bonds and structural elements forming the amorphous matrix, are defined. The values of average coordination number, the relative quantity of chemical bonds, the cohesive energy and the average bond energy are calculated in order to determine the correlation between near- and medium-order parameters and macroscopic properties. The obtained results are explained based on the principles of the chemical bond model.

AJP Fizika  December 24, 2019

THE LOCAL STRUCTURE OF CHALCOGENIDE GLASSY

SEMICONDUCTORS OF SYSTEM As-Ge-Se

H.I. MAMMADOVA

The local structure and optical properties of ChSS Se-Sb layers are studied by X-ray diffraction, Raman scattering and optical transmission spectra. The geometric sizes of medium order area and the “quasi-period” of fluctuation density in the given regions, the optical width of forbidden band and also the chemical bonds and structural elements forming the amorphous matrix, are defined. The values of average coordination number, the relative quantity of chemical bonds, the cohesive energy and the average bond energy are calculated in order to determine the correlation between near- and medium-order parameters and   macroscopic properties. The obtained results are explained based on the principles of the chemical bond model.

AJP Fizika  December 27, 2019

POLARIZATION EFFECTS AT HIGGS BOSON DECAY H => ffgamma

S.К . ABDULLAEV, E.Sh. OMAROVA

In the framework of the Standard Model, the process of the radiation decay of Higgs boson into a fermion-antifermion pair is studied: H => ffgamma. Taking under consideration the fermion spirality and circular polarization of gamma-quanta the analytical expression is obtained for the decay width. The mechanisms of photon bremsstrahlung by the fermion pair and also the fermion and W-boson loop diagrams are considered in detail. The circular polarization of gamma-quanta in the dependence on the angle yeta and the invariant mass x of the fermion pair is studied.

AJP Fizika  December 02, 2019

COMPARATIVE STUDY ON THE ELECTRICAL CHARACTERISTICS OF Au/n-Si AND Au/P3HT/n-Si SCHOTTKY CONTACTS

X. HIDIYEV, A. ASIMOV, A. KERIMOVA

In this work, we have fabricated Au/P3HT/n-Si and Au/n-Si Schottky barrier diodes (SBDs) to investigate the effect of polymer interfacial layer on the electronic parameters. Electronic parameters of these two diodes were calculated from the currente-voltage characteristics. It was seen that the ideality factor value of 3.47 eV calculated for the Au/P3HT/n-Si device was higher than the value of 1.18 eV of the Au/n-Si Schottky diodes. The high values in the ideality factor are caused possibly by various effects such as inhomogeneities of polymer interfacial layer film thickness and series resistance. The Rs values obtained from Cheung’s functionare 18.6 and 495 for Au/n-Si and Au/P3HT/n-Si, respectively. Our results show that P3HT conductice polymer can be used in device modification for Schottky barrier diodes or photodiodes.

AJP Fizika  January 31, 2020

INFLUENCE OF NANOOBJECTS FORMED ON SURFACE OF CuInS2 SINGLE CRYSTALS ON THEIR ELECTRIC AND OPTICAL PROPERTIES

I. GASİMOGLU, G.S. MEHDİYEV, Z. GADİROGLU,  G.M. ASGEROV, N.V. MAKHMUDOVA

 The distribution of nanobjects on surface of CuInS2 single crystals are found and their influence on electric and optical properties of investigated material are studied. They showed that nanobjects behave like defects. Analysis of luminescence spectra showed on presence of exciton-defect complexes.

AJP Fizika  January 23, 2020

ANALYSIS OF THE INFLUENCE OF SULPHUR ON THE DIAMETER OF CARBON NANOTUBES

R.F. HASANOV

The article reports on the role of sulfur in the synthesis of carbon nanotubes (CNTs) by aerosol - assisted chemical vapor deposition method (AACVD). The growth process of CNTs was carried out at the atmospheric pressure and at high temperatures (Т = 850-1000°С). In this process, xylene was used as a carbon source, and a mixture of ferrocene and sulfur was used as a catalyst. It was determined that the addition of sulfur leads to reduction in the average particle size of the catalyst (Fe:S = 10:1) and, as a result, the number of walls of synthesized CNTs decreases. Moreover, it was found that the presence of high content of sulfur in the reactant mixture caused the formation of amorphous carbon, and a small amount of sulfur generated the formation of multi-walled CNTs and carbon fibers. The diameter of CNTs varies in dependence on sulfur content. The characterization of synthesized CNTs was performed by using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy. From the obtained results, it can be concluded that the use of sulfur in the synthesis of CNTs by the AACVD method leads to a decrease of the number of walls of formed CNTs.

AJP Fizika  January 23, 2020

ANALYSIS OF FLUCTUATION CONDUCTIVITY IN Y0,6Cd0,4Ba2Cu3O7-δ

 

V.M. ALIEV, J.A. RAGIMOV, R.I. SELIM-ZADE, B.A. TAIROV

 

The mechanism of formation of excess conductivity in cuprate high-temperature superconductors (HTSC) Y0,6Cd0,4Ba2Cu3O7-δ and YBa2Cu3O7-δ was considered within the framework of the local pair model taking into account the Aslamazov-Larkin theory near Tc. The temperature T0 of the transition from the 2D fluctuation region to the 3D region (the temperature of the 2D-3D crossover) is determined. The coherence lengths of the fluctuation Cooper pairs ξc (0) along the c axis are calculated. It was shown that a partial substitution of Y by Cd in the Y – Ba – Cu – O system leads to a decrease in ξc (0) by ~ 2 times (from 6.32 Ǻ to 3.18 Ǻ), as well as to the expansion as the region of existence pseudogaps and superconducting (SC) fluctuations near Tc. The temperature dependence of the pseudogap Δ * (T) and the values ​​of Δ * (Tc) are determined, and temperatures Tm corresponding to the maximum temperature dependence of the pseudogap in these materials are estimated. The maximum values ​​of the pseudogap in samples Y0,6Cd0,4Ba2Cu3O7-δ and YBa2Cu3O7-δ are 34.56 meV and 28.4 meV correspondingly.

 

AJP Fizika  February 03, 2020

THE STUDY OF THE PHOTORESPONSE OF THE MAPD MATRIX FOR SCINTILLATION RADIATION

 

RAMIL ALADDIN AKBAROV

 

This paper presents the performance of the detection efficiency of gamma radiation with a detector based on LYSO, YSO (Ce), BGO scintillators and a nine-channel array of micropixel avalanche photodiodes (MAPD) ​​with high pixel density (PD) and photon detection efficiency (PDE). The sensitive area of ​​the detector, consisting of single MAPDs with an active area of ​​3.7×3.7 mm2 and has a common output for signal output, is 11.5×11.5 mm2. Breakdown voltages were measured for each channel, as a result of which the optimal operating voltage for the entire array was revealed. The linearity range and energy resolution for each crystal were determined by the energy range from 30 to 1770 keV. The high pixel density of the array made it possible to achieve good linearity in the studied energy range, which makes it possible to use the matrix in gamma-ray spectroscopy detectors.

AJP Fizika  February 24, 2020

FIRST PRINCIPLES STUDY Ge -DOPED MONOLAYER GRAPHENE

 

S.S. HUSEYNOVA

 

The electronic and structural properties of vacancy in graphene and doping of graphene with Ge calculated by the density functional theory (DFT) method within the Generalized Gradient Approximation (GGA). To simulate the vacancy effects have been studied 54 and 18 atom supercells to account for possible program software. Ferromagnetic spin ordering of vacancy of carbon atoms have been studied. It was shown that ferromagnet  ic ordering of the carbon atoms vacancies are located near the doping Ge atom.  In addition DOS for 18 graphene atoms doped by Ge for s,p,d state have been calculated.

AJP Fizika  March 10, 2020

INFLUENCE OF Nd IMPURITY ATOMS AND GAMMA IRRADIATION ON ROENTGENOGRAPHIC SPECTRUM OF GeS LAYERED SINGLE CRYSTAL

A.S. ALEKPEROV, A.A. NABIYEV, T.M. AYDINOVA

The roentgenograms of layered single crystals GeS and Ge0.995Nd0.005S before and after gamma irradiation are investigated. It is revealed that at identical conditions after gamma irradiation by dose 30 krad, the reflex intensity of GaS single crystal roentgenogram increases in 2,25 times and for Ge0.995Nd0.005S single crystal this value achieves up to 35. It is supposed that neodymium atoms form the complex aggregates in compositions of which the oxygen atoms consist in. The crystal temperature increases under the influences of quantum small doses and complexes are destroyed. As a result, the oxygen atoms leave the crystal, neodymium crystals take the cation vacancies migrating in crystal and this leads to crystal structure ordering.       

AJP Fizika  March 03, 2020

CONDITIONS OF INTERNAL AND EXTERNAL INSTABILITY IN SEMICONDUCTORS IN THE PRESENCE OF RECOMBINATION

E.O. MANSUROVA

 

A theoretical analysis of the conditions for the appearance of current oscillations is given and the corresponding values of frequency and electric field in pure and impurity semiconductors are determined. The conditions for converting to zero impedance are found.

AJP Fizika  February 25, 2020

DENSITY OF STATES OF ELECTRON GAS IN NON-STANDARD QUANTUM WELLS

 

S. I. ZEYNALOVA

 

An analytical expression is obtained for the energy spectrum and the density of states of electrons in a quantum well with the potential U = Uoctg2 (πz / L), which in limiting cases transforms into energy spectra and densities of states for models of an infinitely deep well and harmonic the oscillator. The dependence of the density of states on energy for various semiconductor quantum wells is constructed.

AJP Fizika  February 26, 2020

X-RAY DIFFRACTION ANALYSIS, PHOTOLUMINESCENCE, AND RAMAN SPECTRA IN THIN Cu2ZnSnSe4 FILMS OBTAINED BY THE MAGNETRON SPUTTERING METHOD

 

N.N. ABDULZADE, S.Q. NURIYEVA, G.T. ASKERKHANOVA, N.N. MURSAKULOV

 

The article presents an X-ray structural analysis of a thin layer of Cu2ZnSnSe4 obtained on a glass substrate by magnetron sputtering method. It is shown that the layers have an amorphous structure. Thin-layer photoluminescent and Raman spectra were studied using a confocal microspectrometer Nanopinder 30 (Tokyo Instr) (Japan).

 

AJP Fizika  February 28, 2020

CONTENT OF JOURNAL AJP Fizika

Volume XXV, Number 4, December, 2019

 

Section En     pdf --> pagenumber

!

1.   Viscosymetric and densytometric study in water – PEG -KCl                        systems 

      E.A. MASIMOV, B.G. PASHAYEV, N.F. ORUJOVA                       3

2.   Analysis fiducially distributions of possible realizations of technical             and economic parameters of power units

      E.M. FARHADZADEH, A.Z. MURADALIYEV, T.K. RAFIYEVA,               A.A. RUSTAMOVA                                                                            7 

3.  Millimeter vibrational – rotational transitions of gosh-conformer

     of   isopropyl alcohol molecule at J<50

     A.A. ADILOV, Ch.O. QAJAR, S.A. MUSAYEVA,

     A.S. GASANOVA                                                                              11

 

4.   Absorption and luminescence in Bi1-x Sbx alloys

      T.R. MEHDIYEV, Kh.A. GASANOVA                                             14

5.  EPR investigations of γ-irradiated   polytetrafluoroethylene/CdS                  nanocomposites

     E.G. HAJIEVA                                                                                   22

 

6.  Obtaining white light by the combination of Gd3Al5O12:Ce3+ and                Y3Al5O12:Ce3+ phosphors in light emitting diodes

     T.Y. ORUJOV                                                                                    26

 

7. Two- and three-particle decay channels of supersymmetric Higgs               bosons

     S.K. ABDULLAYEV, E.Sh. OMAROVA                                            29

 

8. Higgs boson radiation in arbitrarily polarized electron-positron                   collisions

    M.Sh. GOJAYEV                                                                                40

9. Monopolar injection currents in the layers of GeXAsYTe100-X-Y                     system

    H.I. MAMMADOVA                                                                             52

 

10.Investigation of pixel capacitance and shunt capacitance of

     silicon photomultiplier

     A. MAMMADLI, N. SULEYMANOVA, R. AKBEROV, 

     S.  NURUYEV,      N. SADIGOVA, A. HUSEYNOVA,   

     A. GERAYEVA,  F. AGAYEVA                                                         57

Section Az

1.  Applicatıon of semiconductive nanoelectronic elementin logic devices        and memorıes during information transfer

     S.N. MUSAYEVA, E.A. KERIMOV

 

2.  Functionalization and analysis of Raman scatterıng of carbon nanotubes

     R.G. ABASZADE, S.A. MAMADOVA, R.I. ALAKBAROV, O.A. ALIYEV,      A.M. NABIEV, E.M. ALIYEV, O.A. KAPUSH, Sh.K. SAFARALIYEV

3. Features of forming volume discharges in polymer dielectrics under the         influence of electric discharges

    H.S. ALIYEV

4.  Calculation of axial - vector nucleon form factor in the AdS / QCD soft wall      model

     Sh.A. MAMEDOV, I.I. ATAYEV    

5.   Absorptıon and lumınescence spectra ın Bi0.97 Sb0.03

      Kh.A. GASANOVA 

 

6.  The influence of nano-structures forming on CuGaS2 single crystal plane        on its electric and optical properties

     I. GASIMOGLU, G.S. MEHDIYEV, Z. GADIROGLU, A.G. BAGIROV,          I.T. MAMEDOVA, N.G. MAKHMUDOVA, I.T. NASIBOV

 

7.  Definition of the optimal synthesis method and mechanical properties of        composite varistors based on ZnO-polymer

     Sh.M. AHADZADE

 

8. Elementary processes in the kinetics of electric destruction of                         polyethylene + nanogline nanocomposites

    A.R. SADYGOVA

9.  Influence of BaTiO3 partıcles on the phase transıtıons of  smectıc A               lıquıd crystal wıth posıtıve dıelectrıc anısotropy

      Sh.A. HUMBATOV

10. Main features of the formation of piezo and pyroelectric effects in                   composites based on polymers and multi-components of piezoceramics

      Z.A. DADASHOV

11. Technology for the production of polymer nanocomposites based on               multiwall carbon nanotubes synthesized by aerosol assisted chemical             vapor deposition method

      R.F. HASANOV

13. Study of the process of associated production of the Standard Model             Higgs boson with a vector boson

      F.N. AHMADOV

    ARCHIVE

 

      Fizika

      Transactions

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