Size effects influence on conducting properties of Cu-Nb alloy microcomposites at cryogenic temperature

•Resistivity of Cu-Nb microcomposites grows nonmonotonically with deformation at 10 K.•The charge carriers can be used as a probe for exploring the interface.•Interfaces change qualitatively with true deformation above 5.•Further modification of the interface occurs non-monotonically. A comprehensiv...

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Bibliographic Details
Published in:Cryogenics (Guildford) 2018-03, Vol.90, p.56-59
Main Authors: Guryev, Valentin V., Polikarpova, Maria V., Lukyanov, Pavel A., Khlebova, Natalya E., Pantsyrny, Viktor I.
Format: Article
Language:English
Subjects:
Alloys
Copper
Cryogenic temperature
Cu-Nb
Deformation
Electrical resistivity
Heavy deformation
Interface scattering
Low temperature physics
Nanostructured materials
Niobium base alloys
Proximity effect
Proximity effect (electricity)
Size effects
Transition temperature
True strain
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Summary:•Resistivity of Cu-Nb microcomposites grows nonmonotonically with deformation at 10 K.•The charge carriers can be used as a probe for exploring the interface.•Interfaces change qualitatively with true deformation above 5.•Further modification of the interface occurs non-monotonically. A comprehensive study has been carried out in relation to the conductivity of heavily deformed Cu-16wt%Nb nanostructured wires at room and cryogenic temperatures. When the true strain exceeds 5, the growth rates of the resistivity qualitatively change the behavior at all temperatures. It is shown that such behavior is defined mostly by interface scattering. At 10 K the stepwise increasing of resistivity has been found, what is speculated as a feature of amorphous regions formation at the interface of Cu/Nb. Simultaneously the superconducting transition temperature (Tcs) falls down due to proximity effect. The deviation of experimental Tcs values from predicted by classical model is discussed.
ISSN:0011-2275
1879-2235
DOI:10.1016/j.cryogenics.2018.01.010