Exponential contribution to the electrical resistance and the anomalous temperature dependence of the crystal lattice parameter of superconducting compound Nb/sub 3/Al/sub 0. 75/Ge/sub 0. 25/
Journal Article
·
· Sov. Phys. - Solid State (Engl. Transl.); (United States)
OSTI ID:6164187
The temperature dependences of the electrical resistance (61--300 /sup 0/K) and of the crystal lattice parameter (77--310 /sup 0/K) were determined and the critical temperature was measured for samples of high-temperature superconducting compound Nb/sub 3/Al/sub 0.75/Ge/sub 0.25/ with the A15 lattice and different degrees of atomic ordering. It was found that changes in the nature of the temperature dependence of the resistance were due to evolution of the phonon spectrum caused by changes in the order parameter: an increase in the Bragg-Williams order parameter S reduced the low-frequency peak of the phonon density of states. The observed features of the phonon spectrum were correlated with the dependences a(T) and T/sub c/(S). The A15-type lattice was stable at the investigated temperatures in the order parameter range 0.827< or =S< or =0.987.
- Research Organization:
- Physicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Kharkov
- OSTI ID:
- 6164187
- Journal Information:
- Sov. Phys. - Solid State (Engl. Transl.); (United States), Journal Name: Sov. Phys. - Solid State (Engl. Transl.); (United States) Vol. 24:12; ISSN SPSSA
- Country of Publication:
- United States
- Language:
- English
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Exponential contribution to the electric resistance of the superconducting compound Nb/sub 3/Al/sub 0. 75/Ge/sub 0. 25/ and the anomalous temperature dependence of its crystal-lattice parameter
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Related Subjects
36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM COMPOUNDS
CRITICAL TEMPERATURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
GERMANIUM COMPOUNDS
LATTICE PARAMETERS
LOW TEMPERATURE
MEDIUM TEMPERATURE
NIOBIUM COMPOUNDS
ORDER PARAMETERS
PHYSICAL PROPERTIES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
360102 -- Metals & Alloys-- Structure & Phase Studies
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM COMPOUNDS
CRITICAL TEMPERATURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
GERMANIUM COMPOUNDS
LATTICE PARAMETERS
LOW TEMPERATURE
MEDIUM TEMPERATURE
NIOBIUM COMPOUNDS
ORDER PARAMETERS
PHYSICAL PROPERTIES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE