Pressure Dependence of the Energy Gap Anisotropy in Aluminum

1972 ◽  
Vol 50 (21) ◽  
pp. 2568-2573
Author(s):  
C. R. Leavens ◽  
J. P. Carbotte
Keyword(s):  
Fermi Surface ◽  
Single Crystal ◽  
Pressure Dependence ◽  
Energy Gap ◽  
Superconducting Energy Gap ◽  
Gap Anisotropy ◽  
Pure Single Crystal

We have calculated the superconducting energy gap for a large number of points on the irreducible (1/48)th of the Fermi surface of pure single-crystal aluminum both at zero and finite pressure. It is found that the energy gap anisotropy in aluminum increases with increasing pressure.

Effect of the Superconducting Energy-Gap Anisotropy on the Thermal Conductivity of Tin

1967 ◽  
Vol 163 (2) ◽  
pp. 364-372 ◽  
Author(s):  
J. E. Gueths ◽  
N. N. Clark ◽  
D. Markowitz ◽  
F. V. Burckbuchler ◽  
C. A. Reynolds
Keyword(s):  
Thermal Conductivity ◽  
Energy Gap ◽  
Superconducting Energy Gap ◽  
Gap Anisotropy

A PROPOSED NEW MEASUREMENT OF THE SUPERCONDUCTING GAP IN YBa2Cu3O7

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3290-3293 ◽  
Author(s):  
G. L. ZHAO ◽  
D. BAGAYOKO
Keyword(s):  
Fermi Surface ◽  
Density Functional ◽  
Energy Gap ◽  
Interaction Matrix ◽  
Superconducting Gap ◽  
S Wave ◽  
Minor Variation ◽  
High Tc ◽  
Symmetry Properties ◽  
Superconducting Energy Gap

The superconducting energy gap of YBa 2 Cu 3 O 7 (YBCO) varies strongly with [Formula: see text] and from a sheet of the Fermi surface to another. The strong anisotropic superconducting gap in high Tc materials such as YBCO has led to conflicting d-wave and s-wave interpretations. We have utilized electronic wave functions from the ab-initio density functional calculation and the related electron-phonon interaction matrix elements for the calculation of the superconducting gap values of YBCO. We have found that the superconducting gap on one sheet of the Fermi surface around S-point only shows a minor variation from about 18 meV to 25 meV. Especially, there is no node on this sheet of the Fermi surface around the S-point. We propose a new test measurement of the superconducting gap of YBCO on this sheet of the Fermi surface around the S-point in the Brillouin zone. This measurement is expected to shed light on the gap symmetry properties of high Tc superconductors.

Investigation of the Superconducting-Energy-Gap Behavior of Single-Crystal Rhenium by Tunneling

1971 ◽  
Vol 4 (9) ◽  
pp. 2988-2996 ◽  
Author(s):  
S. I. Ochiai ◽  
M. L. A. MacVicar ◽  
R. M. Rose
Keyword(s):  
Single Crystal ◽  
Energy Gap ◽  
Superconducting Energy Gap

Direct STM mapping of the superconducting energy gap in single crystal BI2SR2CACU2O8+x

1994 ◽  
Vol 7 (2) ◽  
pp. 355-360 ◽  
Author(s):  
E. L. Wolf ◽  
A. Chang ◽  
Z. Y. Rong ◽  
Yu. M. Ivanchenko ◽  
Farun Lu
Keyword(s):  
Single Crystal ◽  
Energy Gap ◽  
Superconducting Energy Gap

On the energy gap in superconducting tin

1962 ◽  
Vol 268 (1333) ◽  
pp. 276-289 ◽  
Keyword(s):  
Single Crystal ◽  
Absorption Edge ◽  
Surface Resistance ◽  
Energy Gap ◽  
Superconducting Transition ◽  
Isotropic Energy ◽  
A Value ◽  
Indium Alloys ◽  
Polycrystalline Alloy ◽  
Gap Anisotropy

The surface resistance of specimens of superconducting tin and of tin-indium alloys has been measured at a frequency of 140 kmc/s and at temperatures near to the superconducting transition. In both single crystal and polycrystalline alloy specimens, the onset of quantum absorption was well defined and corresponded to an isotropic energy gap with a value at absolute zero of about 3·6 kT c . With pure tin, however, the absorption edge was not well defined in specimens oriented away from the tetrad axis; but near to the tetrad axis, there seems to be a considerable region in which the gap varies com paratively slowly, taking a value of about 3·6 kT c . Assuming that the absence of a clearly defined absorption edge for other orientations is the result of gap anisotropy, it is shown that regions in which the gap takes values very different from 3·6 kT c must lie well away from the tetrad axis. The analysis also shows that such regions are comparatively unimportant, and that the 3·6 kT c gap predominates strongly.

Calculation of the Effect of Superconducting Energy-Gap Anisotropy on the Thermal Conductivity of Tin

1968 ◽  
Vol 175 (2) ◽  
pp. 556-559 ◽  
Author(s):  
F. V. Burckbuchler ◽  
D. Markowitz ◽  
C. A. Reynolds
Keyword(s):  
Thermal Conductivity ◽  
Energy Gap ◽  
Superconducting Energy Gap ◽  
Gap Anisotropy
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