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- W2011661501 abstract "High-quality tunnel junctions have been fabricated on thin films of $A15$ Nb-Sn (20-25 at.%) using oxidized $a$-Si tunnel barriers and Pb counterelectrodes. These junctions have been used to measure changes in the gap, the transition temperature ${T}_{c}$, and the tunneling density of states with composition in this important high-${T}_{c}$ superconductor. With the use of the proximity-effect-modified data reduction scheme developed by Arnold and Wolf, values for ${ensuremath{alpha}}^{2}F(ensuremath{omega})$ and ${ensuremath{mu}}^{*}$ are obtained. As the Sn content approaches stoichiometry, the lowest-energy phonon branch in ${ensuremath{alpha}}^{2}F(ensuremath{omega})$ both increases in weight and shifts to lower energy. These two effects combine to produce the increases in $ensuremath{lambda}$ as stoichiometry is approached, and at the same time can account for the observed increase in $frac{2ensuremath{Delta}}{{k}_{B}{T}_{c}}$. The values of ${ensuremath{mu}}^{*}$ remain essentially constant as a function of composition, and hence show no evidence for an increased Coulomb interaction with increasing disorder as recently proposed by Anderson et al." @default.
- W2011661501 created "2016-06-24" @default.
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- W2011661501 date "1984-09-01" @default.
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- W2011661501 title "Microscopic superconducting parameters from tunneling in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>A</mml:mi><mml:mn>15</mml:mn><mml:mn /></mml:math>Nb-Sn" @default.
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- W2011661501 doi "https://doi.org/10.1103/physrevb.30.2590" @default.
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