Volume dependence of the superconducting transition temperature of aluminum calculated from a first-principles potential

1988 ◽  
Vol 38 (14) ◽  
pp. 9495-9499 ◽  
Author(s):  
L. F. MagañBa ◽  
G. J. Vázquez
Keyword(s):  
Transition Temperature ◽  
First Principles ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition ◽  
Volume Dependence

Volume dependence of the superconducting transition temperature for the high-temperature superconductorHgBa2Ca2−xPbxCu3O8+δ

1994 ◽  
Vol 50 (18) ◽  
pp. 13778-13785 ◽  
Author(s):  
Charles C. Kim ◽  
A. R. Drews ◽  
E. F. Skelton ◽  
S. B. Qadri ◽  
M. S. Osofsky ◽  
...  
Keyword(s):  
High Temperature ◽  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition ◽  
Volume Dependence

Use of rescreened pseudopotentials for the superconductivity of aluminum at finite pressures

1981 ◽  
Vol 59 (3) ◽  
pp. 309-314 ◽  
Author(s):  
M. D. Whitmore
Keyword(s):  
Transition Temperature ◽  
Pressure Dependence ◽  
First Principles ◽  
Superconducting Transition Temperature ◽  
Imaginary Axis ◽  
Superconducting Transition ◽  
Volume Changes ◽  
Source Of Error ◽  
Coulomb Pseudopotential ◽  
Phonon Properties

Use is made of the pseudopotential determined by Dagens, Rasolt, and Taylor to calculate from first principles all the microscopic phonon and electron–phonon properties necessary for the superconducting transition temperature of aluminum, Tc, for zero pressure and for volume changes up to −10%. After fitting the Coulomb pseudopotential parameter μ* at zero pressure, Tc is calculated both by solving the Eliashberg gap equations on the imaginary axis, and by employing the approximate formulae of McMillan and of Leavens. The resulting pressure dependence of Tc is unsatisfactory. One source of error appears to be an insufficient pressure-induced shift of the phonon frequencies, indicating a limitation on the use of these pseudopotentials that is not widely appreciated. However, this is not believed to be the only difficulty and other possibilities are briefly discussed.

Volume dependence of the superconducting transition temperature for the high-temperature superconductorHgBa2CuO4+δ

1994 ◽  
Vol 49 (18) ◽  
pp. 13075-13081 ◽  
Author(s):  
Charles C. Kim ◽  
E. F. Skelton ◽  
S. B. Qadri ◽  
V. M. Browning ◽  
M. S. Osofsky ◽  
...  
Keyword(s):  
High Temperature ◽  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition ◽  
Volume Dependence

Correlation Between the Anomalous Pressure Dependence of the Superconducting Transition Temperature in Thallium and the Temperature Dependence of its Knight Shift

1974 ◽  
Vol 52 (8) ◽  
pp. 678-686 ◽  
Author(s):  
J. Schratter ◽  
D. Llewelyn Williams
Keyword(s):  
Transition Temperature ◽  
Temperature Dependence ◽  
Pressure Dependence ◽  
Superconducting Transition Temperature ◽  
Knight Shift ◽  
Superconducting Transition ◽  
Electronic Density ◽  
Nonlinear Variation ◽  
Volume Dependence ◽  
Increasing Temperature

A study of the Knight shift has been carried out on a single crystal of thallium. The isotropic Knight shift decreases with increasing temperature, showing a nonlinear variation which is most pronounced between 50 and 150 K. This behavior is correlated with the anomalous pressure dependence of the superconducting transition temperature at low pressure. From the superconducting data on pure Tl and Tl–Hg alloys, we extract the volume dependence of the electronic density of states, and use it to derive the temperature dependence of the Knight shift. The results agree with the observed data.

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