DIFFERENCES IN THE EFFECT OF ADMIXTURES AND OF PLASTIC DEFORMATION ON THE TEMPERATURE OF SUPERCONDUCTING TRANSITION OF METALS

Journal Article · Sat Dec 01 04:00:00 EST 1962 · Zh. Eksperim. i Teor. Fiz.

OSTI ID:4730534

Lazarev, B G; Lazareva, L S; Makarov, V I

In previous reports on studies concerning the effect of impurities in reducing the superconducting transition temperature, T/sub c/, of a number of metals, the effect was ascribe to a decrease in the mean free path of the conductance elec trons from which it was concluded that distortion of the lattice and deformation of the metal produce a lowering of T/sub c/. In order to test this point, the change in T/sub c/, at the temperature of liquid helium, was evaluated by measuring the resistance ratios of samples of tin containing up to 0.5% Sb both in the annealed and deformed states. The results of this investigation confirm very closely the results of the effect of impurities on the T/sub c/ of tin in the annealed state in that the temperature of superconducting transition is reduced in a regular manner. It was observed, however, that distortion of the metal leads to an opposite effect, an increase in T/sub c/ and, in fact, up to the maximum concentration of impurity which was studied, the increase in T/sub c/ reaches a constant value DELTA T/sub c/ = 0.020 nif- K. The observed rise in the transition temperature is claimed to be associated with the fact that plastic deformation of a metal lowers the Debye temperature, that is, reduces the elastic properties of the metal, thus leading to an increase in the electron-phonon interaction and a subsequent rise in T/sub c/. (TTT)

• Research Organization: Inst. of Physics and Tech., Academy of Sciences, Ukrainian SSR
• NSA Number: NSA-17-018844
• OSTI ID: 4730534
• Journal Information: Zh. Eksperim. i Teor. Fiz., Journal Name: Zh. Eksperim. i Teor. Fiz. Vol. Vol: 43
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ANNEALING
ANTIMONY ALLOYS
DEBYE TEMPERATURE
DEFORMATION
ELECTRIC CONDUCTIVITY
ELECTRONS
HELIUM
IMPURITIES
INTERACTIONS
LATTICES
LOW TEMPERATURE
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
OSCILLATIONS
PHONONS
SUPERCONDUCTIVITY
TEMPERATURE
TIN ALLOYS