Important role of coherence for the heavy-fermion state in CeCu[sub 2]Si[sub 2]

Journal Article · Fri Apr 01 00:00:00 EST 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.10051· OSTI ID:6735938

Mielke, A; Rieger, J J; Scheidt, E; Stewart, G R ^[1]

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1. Institut fuer Physik, Universitaet Augsburg, Memminger Strasse 6, 86135 Augsburg (Germany)

The system Ce(Cu[sub 1[minus][ital x]][ital M][sub [ital x]])[sub 2.2]Si[sub 2] was doped with [ital M]=Pt, Ir, Os, and Ni, always maintaining the original CeCu[sub 2]Si[sub 2] structure. The doped samples as well as the end points (i.e., [ital x]=1) are nonmagnetic. Measurements on the specific heat [ital C] of lower-doped samples ([ital x][lt]0.2) showed a monotonic decrease of [gamma] with increasing doping. This decrease depends [ital only] on the amount of doping and not on [ital M], thus not on the variation of the lattice constant or the electronic structure of the dopants. We conclude that the decrease in [gamma] is primarily determined by the disturbed coherence in the heavy-fermion lattice, and that variation of the Ce-[ital M] ligand hybridization merely plays a secondary role. This result underlines the fact that coherence is a decisive prerequisite for the formation of a heavy-fermion state, and that this coherence is equally dependent on disturbance of the ligand sublattice as of the [ital f]-atom sites.

• OSTI ID: 6735938
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 49:14; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM SILICIDES
SUBSTOICHIOMETRY
SUPERCONDUCTIVITY
COPPER SILICIDES
HYBRIDIZATION
IRIDIUM ADDITIONS
LIGANDS
NICKEL ADDITIONS
OSMIUM ADDITIONS
PLATINUM ADDITIONS
SPECIFIC HEAT
ALLOYS
CERIUM COMPOUNDS
COPPER COMPOUNDS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
IRIDIUM ALLOYS
NICKEL ALLOYS
OSMIUM ALLOYS
PHYSICAL PROPERTIES
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
RARE EARTH COMPOUNDS
SILICIDES
SILICON COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)