The effect of sintering temperature on the intergranular properties and weak link behavior of Bi2223 superconductors
P. Kameli
author
H. Salamati
author
M. Eslami
author
M. A. Khatibi
author
text
article
2019
per
A systematic study of the intergranular properties of (Bi,Pb)2 Sr2 Ca2 Cu3 Oy (Bi2223) polycrystalline samples has been done using the electrical resistivity and AC susceptibility techniques. In this study, we have prepared a series of Bi2223 samples with different sintering temperatures. The XRD results show that by increasing the sintering temperature up to 865° c , the Bi2212 phase fraction decreases. It was found that the Bi2212 phase on the grain boundaries is likely to play the role of the weak links and consequently reduces the intergranular critical current densities.
Iranian Journal of Physics Research
https://www.psi.ir/physics_society_iran_1_home
1682-6957
6
v.
1
no.
2019
1
7
http://ijpr.iut.ac.ir/article_509_fcc3e1e77448698364a22eff047cd215.pdf
Electron localization and metal-insulator transition in the one-dimensional chian of atoms
A. Esmailpour
author
M. Esmaeilzadeh
author
text
article
2019
per
In this paper, the electron localization length was calculated numerically in a one-dimensional chain of atoms with random binary alloy. It is shown that in a one-dimensional finite-size chian of atoms, the localization length of the electron wave function decreases with increasing impurity concentration and with more increasing of the impurity concentration, the localization length becomes smaller than the system size and therefore insulator-metal transition occurs.
Iranian Journal of Physics Research
https://www.psi.ir/physics_society_iran_1_home
1682-6957
6
v.
1
no.
2019
9
13
http://ijpr.iut.ac.ir/article_510_b58351a9b8f015668b7cd42d1b3c8f52.pdf
Cross-section for & gamma e & rarr e & nu& nu& oline and & gamma& gamma& rarr& nu& nu& oline inelastic acattering
M.
Zeinali
author
M.
Haghighat
author
text
article
2019
per
We study processes in which neutrinos can be generated as a possible source for the neutrion emission form neutron stars. In the high energy limit and in the range em< E< Mw the cross sention for ye→evv is analytically calculated. We also calculate the cross section for yy→vv in the noncommutative space. The obtained results in comparison with the cross section for yy→vv and yy→ yvv in the commutative space could be quite important in the astrophysics. As a result the cross section for yy→ vv in the noncommutative spaces, in the range =100-300Gev , is comparable with its counterpart in the commutative space.
Iranian Journal of Physics Research
https://www.psi.ir/physics_society_iran_1_home
1682-6957
6
v.
1
no.
2019
15
26
http://ijpr.iut.ac.ir/article_511_bebf2bd75c28545c2354f7a07b7bb6dd.pdf
Dependent of electrical resistivity of thin wire on magnetic field and temperature
E. Sadeghi
author
M. Zare
author
text
article
2019
per
Variation of electrical resistivity of Bismuth nanowire versus magnetic field the and temperature are considered. We study the size effect and surface scattering of the carrier in thin wire for systems with ellipsoidal fermi surfaces. Results are in good agreement with experimental points.
Iranian Journal of Physics Research
https://www.psi.ir/physics_society_iran_1_home
1682-6957
6
v.
1
no.
2019
27
32
http://ijpr.iut.ac.ir/article_512_b381057695f28232fc00e81fc3d2aae9.pdf
Contribution of CSB interactions in binding energy difference of mirror nuclei
M. Asghari
author
text
article
2019
per
Nolen-Schiffer Anomaly in mirror nuclei due to the NN interactions with isospin mixing between T=0 and T=1 mesons of the same spin and parity are investigated. With the computation of coulomb energy along with the charge symmetry breaking (CSB) effects provide a reasonably accurate description of binding energy differences between 39ca- 39k- , 41cs- 41ca mirror nuclei.
Iranian Journal of Physics Research
https://www.psi.ir/physics_society_iran_1_home
1682-6957
6
v.
1
no.
2019
33
38
http://ijpr.iut.ac.ir/article_513_342dcbe4ba0886cbf140aa3bcdaf335f.pdf
Response of Landau energy levels to the change of magnetic flux in non-isotropic impurities
S. Ramezani Sani
author
A. Morteza Ali
author
M. R. Sarkardei
author
text
article
2019
per
We have studied a practical approach for the inclusion of non-isotropic impurities in the systems showing integer quantum Hall effect. We observe that if the impurity distribution in the direction which the electric field applys, then the localized levels goes out from the origin with respect to the isotropic case, and the Hall step will the clearly observed.
Iranian Journal of Physics Research
https://www.psi.ir/physics_society_iran_1_home
1682-6957
6
v.
1
no.
2019
39
441
http://ijpr.iut.ac.ir/article_514_be98ee948a3c8cb20393d2470336e62e.pdf
The Klein-Gordon and the Dirac oscillators in a non-commutative space and in a constant magnetic field
B. Mirza
author
R. Narimani
author
A. Sadeghi
author
T. Ameri
author
text
article
2019
per
In this paper the Klein-Gordon and the Dirac Oscillators in a non-commutative space and in a constant magnetic field are investigated. It is shown that for a specific value of the magnetic field, one may map these oscillators from a non-commutative space to a commutative space.
Iranian Journal of Physics Research
https://www.psi.ir/physics_society_iran_1_home
1682-6957
6
v.
1
no.
2019
45
48
http://ijpr.iut.ac.ir/article_515_8fb61f959eb05cc132c54f872baeb2df.pdf
The effect of temperature and atmosphere on spinel phase formation of nano-manganese ferrite
B. Nasr
author
J. Amighian
author
M. Mozaffar
author
text
article
2019
per
Phase formation of manganese ferrite prepared by co-precipitation method is studied at different annealing temperatures. It is shown that the spinel phase is formed by quenching only in inert gas. XRD patterns show that the background picks fall in intensity by increasing annealing temperature and the single phase is achieved by magnetic separation.
Iranian Journal of Physics Research
https://www.psi.ir/physics_society_iran_1_home
1682-6957
6
v.
1
no.
2019
49
52
http://ijpr.iut.ac.ir/article_516_f411de2a2066b04e4cf370fb1219e959.pdf
Growth of Cd0.96Zn0.04Te single crystals by vapor phase gas transport method
S. H.
Tabatabai Yazdi
author
M. R.
Alinejad
author
N.
Tajabor
author
text
article
2019
per
Cd0.96Zn0.04Te crystals were grown using vapor phase gas transport method (VPGT). The results show that dendritic crystals with grain size up to 3.5 mm can be grown with this technique. X-ray diffraction and Laue back-reflection patterns show that dendritic crystals are single-phase, whose single crystal grains are randomly oriented with respect to the gas-transport axis. Electrical measurements, carried out using Van der Pauw method, show that the as-grown crystals have resistivity of about 104 Ω cm and n-type conductivity.
Iranian Journal of Physics Research
https://www.psi.ir/physics_society_iran_1_home
1682-6957
6
v.
1
no.
2019
53
53
http://ijpr.iut.ac.ir/article_517_7f120c4708720e27b36a81d1f582498e.pdf