Superconducting state parameters of binary metallic glasses

Open Physics ◽  
2008 ◽  
Vol 6 (2) ◽  
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.

PSEUDOPOTENTIAL IN THE STUDY OF SUPERCONDUCTING STATE PARAMETERS OF METALLIC GLASSES

2004 ◽  
Vol 18 (12n13) ◽  
pp. 573-582 ◽  
Author(s):  
P. N. GAJJAR ◽  
A. M. VORA ◽  
A. R. JANI
Keyword(s):  
Metallic Glasses ◽  
Superconducting State ◽  
Effective Interaction ◽  
Interaction Strength ◽  
Model Potential ◽  
Superconducting State Parameters ◽  
Proposed Model ◽  
Vegard’S Law ◽  
Electron Phonon Coupling ◽  
Alloy Atom

A recently proposed model potential is used to study the superconducting state parameters viz. electron-phonon coupling strength λ, Coulomb pseudopotential μ*, transition temperature TC, isotope effect exponent α and effective interaction strength NOV of 40 metallic glasses of simple, non-simple as well as transition metals. The advanced screening function due to Sarkar et al. has been employed to include the exchange and correlation effects. Instead of Vegard's law, the use of pseudo-alloy-atom model in the investigation of superconducting state properties of metallic glasses is proposed and found successfully.

Superconducting state parameters of La100-C GaC binary metallic glasses

Open Physics ◽  
2008 ◽  
Vol 6 (2) ◽  
Author(s):  
Aditya Vora
Keyword(s):  
Experimental Data ◽  
Local Field ◽  
Metallic Glasses ◽  
Effective Interaction ◽  
Interaction Strength ◽  
Correction Function ◽  
Phonon Coupling ◽  
Local Field Correction ◽  
Electron Phonon Coupling ◽  
Coulomb Pseudopotential

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.

STUDY OF SUPERCONDUCTING STATE PARAMETERS OF TRANSITION METALS BINARY ALLOYS BY A PSEUDOPOTENTIAL APPROACH

2009 ◽  
Vol 23 (02) ◽  
pp. 217-227 ◽  
Author(s):  
ADITYA M. VORA
Keyword(s):  
Superconducting State ◽  
Effective Interaction ◽  
Binary Alloys ◽  
Interaction Strength ◽  
Model Potential ◽  
Superconducting State Parameters ◽  
Local Field Correction ◽  
Electron Phonon Coupling ◽  
Pseudopotential Approach ◽  
Coulomb Pseudopotential

In the present article, we have reported the theoretical study of the superconducting state parameters (SSP) viz. electron–phonon coupling strength λ, Coulomb pseudopotential μ*, transition temperature TC, isotope effect exponent α and effective interaction strength N0V of a 3d-transition metal-based binary alloys using Ashcroft's empty core (EMC) model potential. 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. A considerable influence of various exchange and correlation functions on λ and μ* is found from the present study. The present results of the SSP are found in qualitative agreement with the available experimental data wherever they exist.

Study of superconducting state parameters of amorphous metals by a pseudopotential theory

Open Physics ◽  
2008 ◽  
Vol 6 (2) ◽  
Author(s):  
Aditya Vora
Keyword(s):  
Superconducting State ◽  
Effective Interaction ◽  
Interaction Strength ◽  
Amorphous Metals ◽  
Pseudopotential Theory ◽  
Superconducting State Parameters ◽  
Local Field Correction ◽  
Electron Phonon Coupling ◽  
First Time ◽  
Exchange And Correlation

AbstractThe theoretical computation 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 some monovalent (Cu and Au), divalent (Ca, Sr, Ba, αHg, βHg and Ra) and polyvalent (Lu, Rh, Sc, Y, La, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Ac, Th, Hf, Ru, Os, Ir, V, Ta, Pa, Cr, Mo, U, Re, Np and Pu) amorphous metals based on the different groups of the periodic table have been carried out for the first time using the well known Ashcroft’s empty core (EMC) model pseudopotential. Herein, we have employed five different types of local field correction functions proposed by Hartree (H), Taylor (T), Ichimaru-Utsumi (IU), Farid et al. (F) and Sarkar et al. (S) to study the exchange and correlation effects on the present investigations. A very strong influence of all the exchange and correlation functions have been observed in the present study. Our results are in fair agreement with documented theoretical as well as experimental data. A strong dependency of the SSP of amorphous metals on the valency Z was found.

THE STUDY OF SUPERCONDUCTING STATE PARAMETERS OF in-BASED BINARY ALLOYS BY PSEUDOPOTENTIAL

2003 ◽  
Vol 17 (31n32) ◽  
pp. 6001-6017 ◽  
Author(s):  
P. N. GAJJAR ◽  
A. M. VORA ◽  
MINAL H. PATEL ◽  
A. R. JANI
Keyword(s):  
Superconducting State ◽  
Effective Interaction ◽  
Binary Alloys ◽  
Interaction Strength ◽  
Model Potential ◽  
Superconducting State Parameters ◽  
Vegard’S Law ◽  
Electron Phonon Coupling ◽  
Effective Valence ◽  
Alloy Atom

The study 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 N0V of In-based binary alloys In 1-x Na x, In 1-x Mg x, In 1-x Zn x, In 1-x Tl x, In 1-x Sn x, In 1-x Pb x and In 1-x Bi x have been made extensively in the present work using a model potential. To explain electron–ion interaction pseudo-alloy-atom (PAA) model is applied for the first time instead of Vegard's Law. A considerable influence of various exchange and correlation functions on λ and μ* is found from the present study. It is also concluded that T C strongly depends on the value of the effective valence Z* of binary alloys.

SUPERCONDUCTING STATE PARAMETERS OF 4d-TRANSITION METALS BASED BINARY ALLOYS

2008 ◽  
Vol 22 (29) ◽  
pp. 2881-2892 ◽  
Author(s):  
ADITYA M. VORA
Keyword(s):  
Transition Metals ◽  
Superconducting State ◽  
Effective Interaction ◽  
Binary Alloys ◽  
Interaction Strength ◽  
Model Potential ◽  
Superconducting State Parameters ◽  
Electron Phonon Coupling ◽  
Alloy Atom ◽  
Potential Formalism

The theoretical study of the superconducting state parameters (SSP) viz. electron–phonon coupling strength λ, Coulomb pseudopotential μ*, transition temperature TC, isotope effect exponent α and effective interaction strength NoV of 4d-transition metals based binary alloys have been made extensively in the present work using a model potential formalism for the first time. In the present computation, the use of pseudo-alloy-atom model (PAA) is proposed and found successful. A considerable influence of various exchange and correlation functions on λ and μ* is found from the present study. The present results of the SSP are found in qualitative agreement with the available experimental data wherever they exist.

Temperature Dependent Surface Properties of Liquid Alkali Metals

2013 ◽  
Vol 209 ◽  
pp. 44-47 ◽  
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.

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