Ratio 2?0/kT c in a van Hove superconductor

1996 ◽  
Vol 9 (5) ◽  
pp. 485-486 ◽  
Author(s):  
S. Ratanaburi ◽  
P. Udomsamuthirun ◽  
S. Yoksan
Keyword(s):  
Van Hove Superconductor

DEPENDENCE OF THE GAP-RATIO ON THE FERMI LEVEL SHIFT IN A VAN HOVE SUPERCONDUCTOR

2000 ◽  
Vol 14 (19n20) ◽  
pp. 2127-2133
Author(s):  
S. KASKAMALAS ◽  
B. KRUNAVAKARN ◽  
S. YOKSAN
Keyword(s):  
Fermi Level ◽  
High Temperature Superconductivity ◽  
Bcs Theory ◽  
Level Shift ◽  
Zero Temperature ◽  
Fermi Level Shift ◽  
Gap Ratio ◽  
Close Proximity ◽  
Analytic Expressions ◽  
Van Hove Superconductor

To understand the origin of high temperature superconductivity model based on the close proximity of the Fermi level to a quasi-two-dimensional Van Hove Singularity (VHS) in the density of states has been suggested. Here we present our study of the dependence of the zero temperature gap to the critical temperature for s- and d-wave superconductors on the Fermi level shift (δ) from the VHS within the BCS theory. Exact numerical calculations for the s and d gap ratios are carried out and approximate analytic expressions for the ratio are given. We find that the maximum gap ratio occurs at δ=0, and it decreases symmetrically with increasing δ.

Properties of a van Hove superconductor

1991 ◽  
Vol 185-189 ◽  
pp. 1545-1546 ◽  
Author(s):  
R.S. Markiewicz
Keyword(s):  
Van Hove Superconductor

Pair-Breaking Effect in a van Hove Superconductor

1997 ◽  
Vol 10 (5) ◽  
pp. 503-506 ◽  
Author(s):  
I. Tifrea ◽  
M. Crisan ◽  
S. Yoksan
Keyword(s):  
Pair Breaking ◽  
Breaking Effect ◽  
Van Hove Superconductor
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