Effect of composition on the superconductivity of CeCu/sub 2/Si/sub 2/
The superconductivity in fifteen off-stoichiometric samples of the compound CeCu/sub 2/Si/sub 2/ was investigated, and a strong dependence of T/sub c/ on the concentration of all three constituents was found. The variation of T/sub c/ was particularly pronounced for the series of CeCu/sub 2plus-or-minusdelta/Si/sub 2/; the highest (0.67 K) and the sharpest T/sub c/ was found in copper-rich samples, while T/sub c/ of the sample containing only one atomic percent less copper was lower than 0.07 K. Metallographic and crystallographic studies, combined with differential thermal analysis on some of these samples allowed us to discuss the limit of the homogeneity range and the type of formation of CeCu/sub 2/Si/sub 2/. Supplementary results on other compounds in the ternary system Ce-Cu-Si are also presented. Superconductivity was not found above 0.07 K in the compounds isostructural to CeCu/sub 2/Si/sub 2/: CeT/sub 2/Si/sub 2/ (T = Co, Pd, Rh, and Ru) and CeT/sub 2/Ge/sub 2/ (T = Co and Ni).
- Research Organization:
- Departement de Physique de la Matiere Condensee, Universite de Geneve, 24 Quai Ernest-Ansermet, 1211 Geneve 4, Switzerland
- OSTI ID:
- 6096231
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 27:5; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CERIUM COMPOUNDS
CERIUM SILICIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER SILICIDES
CRITICAL TEMPERATURE
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LATTICE PARAMETERS
PHYSICAL PROPERTIES
QUANTITY RATIO
RARE EARTH COMPOUNDS
SCATTERING
SILICIDES
SILICON COMPOUNDS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION