Abstract
Electrical resistivity measurements in the temperature range 1.5–35 K on two copper alloys containing 115 and 380 atomic ppm iron are reported, in their unannealed state and also after annealing for 16 and 66 h in fore-vacuum at 530–550°C. Below the temperature of the resistivity minimum the impurity resistivity Δρ has the Kondo lnT behavior. However, in the liquid helium region the resistivity drops from its value atT=0, in proportion toT2, conforming to Nagaoka's theory forT<TK/5. The Kondo temperatureTK is evaluated from the Δρ versusT2 plots using Nagaoka's equation and is found to decrease with increasing concentration. Annealing is found to reduce the effective iron concentration and alsoTK. The impurity resistivity per atomic percent in our samples can be expressed as a universal function ofT/TK at the lowest temperatures underTK/4.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
