Temperature and magnetic-field dependence of the superconducting order parameter in Zn studied by point-contact spectroscopy
Yu. G. Naidyuk, H. v. Löhneysen, I. K. Yanson
DOI 10.1103/PhysRevB.54.16077 · Physical Review B
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Abstract
The differential resistance dV/dI vs voltage V of Zn-Ag point contacts (PC’s) is measured in the superconducting state to evaluate the temperature and magnetic-field dependence of the superconducting order parameter Δ and Γ=ħ/τ in Zn using the modified Blonder-Tinkham-Klapwijk theory including a finite quasiparticle lifetime τ. The temperature dependence of Δ(T) of all PC’s follows the BCS theory while for the magnetic field dependence of Δ(B) there are marked differences among different PC’s. In one case the Δ(B) dependence shows a first-order transition at BcPC<Bcbulk for other PC’s Δ(B) decreases continuously in a magnetic field and vanishes at BcPC≫Bcbulk. The parameter Γ which describes the broadening of the quasiparticle density of states (DOS) in the superconductor is almost independent of B in the first case, in contrast to the increase in a magnetic field in the second case. Moreover, in zero field Γ increases with PC resistance. Possible reasons for the DOS broadening in zero field and with increasing magnetic field or increasing PC resistance are discussed. © 1996 The American Physical Society.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Zn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.83 | Pressure not reported | onset |
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