Semiempirical local-field correction function for electrons in Li metal

AbstractThe theoretical investigations of the superconducting state parameters (SSP) viz. electron-phonon coupling strength λ, Coulomb pseudopotential μ*, transition temperature T C, isotope effect exponent α and effective interaction strength N O V of six binary La100-C GaC (C = 16, 20, 22, 24, 26 and 28 at. %) metallic glasses have been reported using Ashcroft’s empty core (EMC) model potential for the first time. Five local field correction functions proposed by Hartree (H), Taylor (T), Ichimaru-Utsumi (IU), Farid et al. (F) and Sarkar et al. (S) are used in the present investigation to study the screening influence on the aforesaid properties. It is observed that the electron-phonon coupling strength λ and the transition temperature T C are quite sensitive to the selection of the local field correction functions, whereas the Coulomb pseudopotential μ*, isotope effect exponent α and effective interaction strength N O V show weak dependences on the local field correction functions. The T C obtained from H-local field correction function are found in qualitative agreement with available experimental data and show almost linear nature with the concentration (C) of ‘Ga’ element. A linear T C equation is proposed by fitting the present outcomes for H-local field correction function, which is in conformity with other results for the experimental data. Also, the present results are found to be in qualitative agreement with other such earlier reported data, which confirms the superconducting phase in the metallic glasses.

Download Full-text

Temperature Dependent Surface Properties of Liquid Alkali Metals

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.209.44 ◽

2013 ◽

Vol 209 ◽

pp. 44-47 ◽

Cited By ~ 1

Author(s):

Yogeshkumar A. Sonvane ◽

Pankajsinh B. Thakor ◽

P.N. Gajjar ◽

Ashvin R. Jani

Keyword(s):

Surface Properties ◽

Local Field ◽

Alkali Metals ◽

Theoretical Data ◽

Model Potential ◽

Correction Function ◽

Temperature Dependent ◽

Liquid Alkali Metal ◽

Local Field Correction ◽

Liquid Alkali Metals

Temperature dependent surface properties like surface tension (γ) and surface entropy (SV) of liquid alkali metals are studied in the present paper. Our newly constructed parameter free model potential is used to describe the electron-ion interaction. To see the influence of local field correction function on surface properties of liquid alkali metal, we have used Sarkar et al local field correction function. The present results are found in good agreement with available experimental data as well as other theoretical data. Lastly we conclude that our model potential is capable to explain surface properties of liquid alkali metals.

Download Full-text

Concentration Depended Thermodynamic Properties of Fe-Co Liquid Binary Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.665.143 ◽

2013 ◽

Vol 665 ◽

pp. 143-149 ◽

Cited By ~ 1

Author(s):

Y.A. Sonvane ◽

J.J. Patel ◽

Pankajsinh B. Thakor ◽

P.N. Gajjar ◽

Ashvin R. Jani

Keyword(s):

Thermodynamic Properties ◽

Local Field ◽

Binary Alloys ◽

Model Potential ◽

Correction Function ◽

Heat Of Mixing ◽

Local Field Correction ◽

Free Model ◽

Volume Of Mixing ◽

Liquid Binary Alloy

The thermodynamic properties like heat of mixing (ΔE), entropy of mixing (ΔS) and volume of mixing (ΔΩ) of Fe-Co liquid binary alloys are computed using our newly constructed parameter free model potential. We have also attempted to investigate the effect of various forms of exchange and correlation functions, namely, Hartree (H) and Taylor (T) on the thermodynamic properties of Fe-Co liquid binary alloys. It is found that the proper choice of the model potential along with the local field correction function play an important role in investigating the thermodynamic properties of Fe-Co liquid binary alloys.

Download Full-text

RESIDUAL RESISTIVITY OF DILUTE ALLOYS

International Journal of Modern Physics B ◽

10.1142/s0217979208038673 ◽

2008 ◽

Vol 22 (05) ◽

pp. 517-527

Author(s):

ADITYA M. VORA

Keyword(s):

Local Field ◽

Model Potential ◽

Parametric Model ◽

Residual Resistivity ◽

Correction Function ◽

Dilute Alloys ◽

Local Field Correction ◽

Potential Formalism ◽

First Time ◽

Selection Of

The residual resistivity for 156 dilute alloys of 19 hosts of different groups of the periodic table has been studied on the basis of the single parametric model potential formalism. Ashcroft's empty core model (EMC) potential is explored for the first time with five different local field correction functions, viz, Hartree (H), Taylor (T), Ichimaru–Utsumi (IU), Farid et al. (F), and Sarkar et al. (S) to investigate the effect of the exchange and correlation on the aforesaid properties. The comparison of the presently computed outcomes with the available theoretical and experimental data is highly encouraging. The investigation of residual resistivity is found to be quite sensitive to the selection of local field correction function, showing a significant variation with the change in the function.

Download Full-text

Superconducting state parameters of binary metallic glasses

Open Physics ◽

10.2478/s11534-008-0059-4 ◽

2008 ◽

Vol 6 (2) ◽

Cited By ~ 1

Author(s):

Aditya Vora

Keyword(s):

Local Field ◽

Metallic Glasses ◽

Superconducting State ◽

Effective Interaction ◽

Interaction Strength ◽

Model Potential ◽

Correction Function ◽

Superconducting State Parameters ◽

Local Field Correction ◽

Binary Metallic Glasses

AbstractAshcroft’s empty core (EMC) model potential is used to study the superconducting state parameters (SSPs) viz. electron-phonon coupling strength λ, Coulomb pseudopotential μ*, transition temperature T C, isotope effect exponent αand effective interaction strength N O V of some binary metallic glasses based on the superconducting (S), conditional superconducting (S’) and non-superconducting (NS) elements of the periodic table. Five local field correction functions proposed by Hartree (H), Taylor (T), Ichimaru-Utsumi (IU), Farid et al. (F) and Sarkar et al. (S) are used for the first time with EMC potential in the present investigation to study the screening influence on the aforesaid properties. The T C obtained from the H-local field correction function are in excellent agreement with available theoretical or experimental data. In the present computation, the use of the pseudo-alloy-atom model (PAA) was proposed and found successful. Present work results are in qualitative agreement with such earlier reported experimental values which confirm the superconducting phase in all metallic glasses. A strong dependency of the SSPs of the metallic glasses on the valence ‘Z’ is identified.

Download Full-text

Refractive Index of BAs1-xPx Semiconductors

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.209.225 ◽

2013 ◽

Vol 209 ◽

pp. 225-228

Author(s):

Paresh S. Vyas ◽

P.N. Gajjar ◽

Ashvin R. Jani

Keyword(s):

Refractive Index ◽

Ternary Alloy ◽

Local Field ◽

Ternary Alloys ◽

Correction Function ◽

Group Iii V Semiconductors ◽

Virtual Crystal Approximation ◽

Group Iii ◽

Local Field Correction ◽

Selection Of

Ternary alloys of group III-V semiconductors have important applications in fabrication of electro-optical devices. Their refractive index and related optical properties are of attractive interest in theoretical and experimental study. According to the Philips scale of iconicity, BP (fi =0.006) and BAs (fi =0.002) are the most covalent of the III-V semiconductors and there are interesting consequences of this property. We present a theoretical procedure for the study of refractive index of ternary alloy BAs1-xPx. The calculations are based on the pseudopotential formalism in which local potential coupled with the virtual crystal approximation (VCA) is applied to evaluate refractive index for the entire range of the alloy composition x of the ternary alloy BAs1-xPx. To incorporate screening effect, Nagy’s local field correction function has been employed. The screening functions of Hartree, Taylor, Ichimaru et al., Farid et al. and Sarkar et al. are also integrated for comparative study. Our results for parent compounds are compared to experiment and other available such theoretical findings and showed relatively good agreement. During present theoretical study it is concluded that refractive index fairly depends on the selection of the local field correction function.

Download Full-text