Nuclear quadrupole resonance and heavy-fermion superconductivity in CeCu/sub 2/Si/sub 2/
/sup 63/Cu nuclear quadrupole resonance (NQR) has been observed in the ternary compound CeCu/sub 2/Si/sub 2/ which, when stoichiometric, is a heavy-fermion superconductor. In a superconducting specimen (T/sub c/approx. =0.6 K) the observed temperature dependence of the spin-lattice relaxation rate 1/T/sub 1/(T) is consistent with a conventional quasiparticle excitation spectrum below T/sub c/, with a pair-breaking parameter approximately half the value for suppression of superconductivity. Features in 1/T/sub 1/(T) between T/sub c/ and 1.2 K appear to signal a phase transition, possibly structural in nature. NQR data from a nonsuperconducting sample are consistent with extensive disorder in the Cu site occupation.
- Research Organization:
- Department of Physics, University of California, Riverside, California 92521
- OSTI ID:
- 6231043
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 30:3; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
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& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOY SYSTEMS
ALLOYS
CERIUM ALLOYS
COPPER
COPPER ALLOYS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMIONS
IMPURITIES
METALS
NUCLEAR QUADRUPOLE RESONANCE
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
RELAXATION
RESONANCE
SILICON ALLOYS
SPIN-LATTICE RELAXATION
STOICHIOMETRY
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TERNARY ALLOY SYSTEMS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRANSITION TEMPERATURE