Physical Review Letters · 1990 · 42 citations · 5 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMetallic MaterialsSolid State PhysicsElectrical ConductivityMagnetic Properties Of SolidsMagnetism In SolidsMetalsStrongly Correlated Electron SystemsSuperconducting MaterialsConductionCritical TemperatureDisordered SuperconductivityHigh-temperature SuperconductorsImpuritiesImpurity DefectsSuperconducting Critical TemperatureSuperconducting Properties
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 ${\mathit{T}}_{\mathit{c}}$ and appears to be due to interaction between superconducting fluctuations and spin. For a given level of impurities this phenomenon is peaked around ${\mathrm{Cu}}_{50}$${\mathrm{Zr}}_{50}$, but is observable from 36 to 60 at.% Zr. When the Cr impurity concentration is varied in ${\mathrm{Cu}}_{50}$${\mathrm{Zr}}_{50}$, 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.
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Low-Temperature Properties of a Superconducting Disordered Metal
J. E. Graebner, B. Golding, R. J. Schutz et al. · Physical Review Letters · 1977 · 175 citations