Superconducting classes of heavy-fermion materials

Journal Article · Wed Mar 01 04:00:00 EST 1989 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.39.4145· OSTI ID:6362303

Ozaki, M; Machida, K

Stimulated by recent remarkable findings which lead to a common feature of all four known heavy-fermion superconductors UPt/sub 3/, (U,Th)Be/sub 13/, URu/sub 2/Si/sub 2/, and CeCu/sub 2/Si/sub 2/, namely, a close proximity between the magnetism and unconventional superconducting pairing state we present a general framework on how to identify the superconducting classes. Taking into account the existence of the spin-density wave (SDW) above T/sub c/ in UPt/sub 3/ and URu/sub 2/Si/sub 2/ and below T/sub c/ in (U,Th)Be/sub 13/ and CeCu/sub 2/Si/sub 2/, we enumerate group theoretically the pairing states compatible with given space-group symmetry according to the Landau subordination scheme for the second-order phase transition. This enables us to effectively narrow down the possible states. These enumerated states are quite general, independent of particular models or pairing interaction forms. Then we give some physical arguments on the relative stability among the allowed states. Maximally utilizing experimental and theoretical data available at present, we attempt to decrease the number of the possible states and obtain the most plausible candidates for each material. To confirm the emerging universal feature that the ground state in heavy-fermion superconductors is the coexisting phase with the magnetism, further experiments are proposed, based on our results.

• Research Organization: Department of Physics, Kyoto University, Kyoto, 606 Japan
• OSTI ID: 6362303
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:7; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTINIDE ALLOYS
ALLOYS
BERYLLIUM ALLOYS
BINDING ENERGY
CERIUM ALLOYS
CLASSIFICATION
COPPER ALLOYS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY
ENERGY LEVELS
FERMIONS
GROUP THEORY
INTERACTIONS
INTERMETALLIC COMPOUNDS
MAGNETIC PROPERTIES
MATHEMATICS
PAIRING ENERGY
PAIRING INTERACTIONS
PHYSICAL PROPERTIES
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
RARE EARTH ALLOYS
RUTHENIUM ALLOYS
SILICON ALLOYS
SUPERCONDUCTIVITY
THORIUM ALLOYS
URANIUM ALLOYS
WAVE PROPAGATION