CRITICAL TEMPERATURE OF LAYERED SUPERCONDUCTORS IN INTERMEDIATE e-ph COUPLING: APPLICATION TO MgB2

2006 ◽  
Vol 20 (21) ◽  
pp. 3093-3099 ◽  
Author(s):  
I. N. ASKERZADE
Keyword(s):  
Experimental Data ◽  
Critical Temperature ◽  
Qualitative Agreement ◽  
Magnesium Diboride ◽  
Layered Superconductors ◽  
Eliashberg Theory

Critical temperature of layered superconductors is studied using anisotropic Eliashberg theory in intermediate e-ph coupling. The results are shown to be in qualitative agreement with experimental data for the superconducting magnesium diboride MgB 2.

scholarly journals Standard Behaviour of Bi2Sr2CaCu2O8+δ Overdoped

2021 ◽  
Vol 6 (2) ◽  
pp. 13
Author(s):  
Giovanni Alberto Ummarino
Keyword(s):  
Experimental Data ◽  
Critical Temperature ◽  
Excellent Agreement ◽  
Free Parameter ◽  
Theoretical Calculations ◽  
Spin Fluctuations ◽  
Superconducting Gap ◽  
Eliashberg Theory ◽  
Antiferromagnetic Spin ◽  
D Wave

I calculated the critical temperature and superconducting gap in the framework of one band d wave Eliashberg theory with only one free parameter in order to reproduce the experimental data relative to Bi2Sr2CaCu2O8+δ(BSCCO) in the overdoped regime. The theoretical calculations are in excellent agreement with the experimental data and indicate that cuprates in the overdoped regime are well described by standard d-wave Eliashberg theory with coupling provided by antiferromagnetic spin fluctuations.

THE UPPER CRITICAL FIELD OF THIN FILMS OF TWO-BAND SUPERCONDUCTORS: AN APPLICATION TO MgB2

2004 ◽  
Vol 18 (30) ◽  
pp. 1525-1531 ◽  
Author(s):  
I. N. ASKERZADE
Keyword(s):  
Experimental Data ◽  
Thin Films ◽  
Temperature Dependence ◽  
Critical Field ◽  
Qualitative Agreement ◽  
Magnesium Diboride ◽  
Upper Critical Field ◽  
Ginzburg Landau

Temperature dependence of the upper critical field [Formula: see text] of thin films of two-band superconductors is studied using the two-band Ginzburg–Landau (G–L) theory. The results are shown to be in qualitative agreement with experimental data for the superconducting magnesium diboride MgB 2 films.

scholarly journals Application of a new friction theory to ice and snow

1994 ◽  
Vol 19 ◽  
pp. 155-157 ◽  
Author(s):  
Lasse Makkonen
Keyword(s):  
Experimental Data ◽  
Theoretical Investigation ◽  
Energy Flux ◽  
Dry Friction ◽  
Qualitative Agreement ◽  
Interface Layer ◽  
Contact Areas ◽  
Frictional Properties ◽  
Friction Theory ◽  
Molecular Scale

A new theory, in which friction is interpreted as the energy flux required to form surface at contact asperities, is applied to sliding on ice and snow. The results of this theoretical investigation show that in dry friction the relevant contact areas are of almost molecular scale. The properties of the interface layer in ice and snow friction arc poorly known, so that the implications of this new theory are somewhat speculative. However, qualitative agreement with experimental data is good, and the theory provides explanations to the success of some empirically developed methods of improving the frictional properties of skis and sledges.

scholarly journals Critical Temperature for Ordered-Disordered Phase Transformation in Cu3Au under Pressure

2018 ◽  
Vol 2018 ◽  
pp. 1-4
Author(s):  
Pham Dinh Tam ◽  
Bui Duc Tinh ◽  
Nguyen Quang Hoc ◽  
Pham Duy Tan
Keyword(s):  
Experimental Data ◽  
Phase Transformation ◽  
Critical Temperature ◽  
Moment Method ◽  
Statistical Moment ◽  
Disordered Phase ◽  
Good Agreement ◽  
Statistical Moment Method

We use the statistical moment method to study the dependence of the critical temperature Tc for Cu3Au on pressure in the interval from 0 to 30 kbar. The calculated mean speed of changing critical temperature to pressure is 1.8 K/kbar. This result is in a good agreement with the experimental data.

The dependence of the critical temperature on pressure

2020 ◽  
Vol 34 (29) ◽  
pp. 2050276
Author(s):  
Thaipanya Chanpoom
Keyword(s):  
Experimental Data ◽  
Critical Temperature ◽  
Intermetallic Compounds ◽  
Analytic Form ◽  
Exact Equation ◽  
Effect Of Pressure ◽  
Iron Chalcogenides

The aim of this research is to study the critical temperature depending on the pressure of one-band superconductor. We derive the exact equation of the critical temperature [Formula: see text] by using the BCS-like model. The effect of pressure and pseudogap on critical temperature has been investigated. The analytic form and the approximation of the critical temperature are shown. First, we consider the effect of pressure on the critical temperature and find that the critical temperature increased as pressure is increased which fits well with the experimental data of Tl-based and Bi-based superconductors. Second, the effect of the pseudogap on the critical temperature is considered. We found that the critical temperature is decreased as pressure increased which agrees to the data of [Formula: see text], the iron chalcogenides [Formula: see text], intermetallic compounds [Formula: see text] and [Formula: see text] superconductors.

Vapor pressure of liquid argon, krypton, and xenon

1969 ◽  
Vol 47 (3) ◽  
pp. 267-273 ◽  
Author(s):  
D. H. Bowman ◽  
Ronald A. Aziz ◽  
C. C. Lim
Keyword(s):  
Experimental Data ◽  
Regression Analysis ◽  
Critical Temperature ◽  
Vapor Pressure ◽  
Liquid Argon ◽  
Quantum Corrections ◽  
Functional Relations ◽  
Potential Parameters ◽  
Corresponding States Principle ◽  
Pressure Analysis

The vapor pressure of liquid argon, krypton, and xenon was measured from below the normal boiling temperature to close to the critical temperature. Functional relations were fitted by a multiple regression analysis to the experimental data. Data of other authors are compared directly with the results presented here.Comparison of the vapor pressure curves for the three liquids showed that the classical corresponding states principle was obeyed only poorly and that it was necessary to include quantum corrections in comparing the reduced curves. The adjusted reduction factors agreed reasonably well with those found from vapor pressure analysis by other workers. De Boer plots on the basis of our potential parameters are more linear than those using the parameters of Boato and Casanova.

Rheological Behavior of Semisolid Al-6.5wt%Si Alloy under Cyclic Shear Deformation

2011 ◽  
Vol 306-307 ◽  
pp. 104-107
Author(s):  
Hong Chao Luo ◽  
Jun Mei Yang ◽  
Li Yuan Sun ◽  
Li Ping Ju
Keyword(s):  
Experimental Data ◽  
Shear Rate ◽  
Hysteresis Loop ◽  
Shear Deformation ◽  
Rheological Behavior ◽  
Qualitative Agreement ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Cyclic Shear ◽  
The Difference

In the present work, the MCF model for semisolid metal slurries (SSMS) is applied to investigate the thixotropy of the Al-6.5wt%Si alloy under cyclic shear deformation. The study shows that the semisolid Al-6.5wt%Si alloy has the behavior of thixotropy. The area of the hysteresis loop increases with decreasing the up-time, the initial shear rate and increasing resting time, solid volume fraction and maximum shear rate, respectively. These results have qualitative agreement with the experimental data. The origin of the hysteresis loop is atrributed to the difference between the deagglomeration rate and the agglomeration rate.

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