Electronic disorder in superconducting amorphous Zr-Co-P: Comparison with results for Tc and Bc2 of amorphous alloys
M. Ahlgren, P. Lindqvist, A. Nordström, Ö. Rapp
DOI 10.1103/PhysRevB.49.9716 · Physical Review B
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Abstract
The superconducting transition temperature and the upper critical magnetic field of amorphous Zr67Co33−xPx, x=0,5,11, are studied. Comparison of critical-field parameters for several different amorphous alloys show that an anomalously enhanced critical field cannot be simply correlated to other material properties. Results from different methods to increase disorder in three-dimensions are compared. The normalized Tc of Zr67Co33−xPx samples, and published results for H-doped samples and neutron-irradiated samples all show a similar dependence of the resistivity increase. This relation extends to below 20% of the initial Tc and it can be obtained from the Fukuyama-Ebisawa-Maekawa theory with a single adjustable parameter. The widths of the superconducting transitions in the magnetic field decrease strongly with decreasing temperature for Zr-Co-P but remain finite at the lowest measuring temperatures. The critical magnetic field increases with increased disorder, which agrees with recent observations from neutron irradiation and cannot be explained by current theories for disorder effects.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Zr67Co33 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | midpoint |
| Zr67Co28P5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | midpoint |
| Zr67Co22P11 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | midpoint |
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