New resistance anomaly in the superconducting fluctuation region of disordered Cu-Zr alloys with dilute magnetic impurities
P. Lindqvist, A. Nordström, Ö. Rapp
DOI 10.1103/PhysRevLett.64.2941 · Physical Review Letters
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Abstract
In disordered superconducting Cu-Zr alloys with dilute magnetic impurities, we have observed a new type of resistance anomaly which gives rise to strongly increased scattering of conduction electrons in a narrow temperature range above Tc and appears to be due to interaction between superconducting fluctuations and spin. For a given level of impurities this phenomenon is peaked around Cu50Zr50, but is observable from 36 to 60 at.% Zr. When the Cr impurity concentration is varied in Cu50Zr50, a resistance peak can be observed for 100–600 ppm Cr with a maximum peak height of about 6% of the measured resistance. The effect is destroyed by a magnetic field of some tenths of a tesla.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Cu50Zr50 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | midpoint |
| Cu40Zr60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.4 | Pressure not reported | midpoint |
| Cu34Zr66 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.5 | Pressure not reported | midpoint |
| Cu57Zr43 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.65 | Pressure not reported | midpoint |
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