Chemical bonding topology of superconductors. 4. Heavy fermion superconductors

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1997.7415· OSTI ID:576442

King, R B ^[1]

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1. Univ. of Georgia, Athens, GA (United States)

Heavy fermion superconductors can be classified into the following two types based on their structures: (1) ternary transition metal carbides, borides, and silicides containing {line_integral}-block metals exhibiting stable multiple oxidation states such as cerium in CeCu{sub 2}Si{sub 2}, CeRu{sub 3}B{sub 2}, and CeRu{sub 3}Si{sub 2} or uranium in Uru{sub 2}Si{sub 2} and U{sub 2}PtC{sub 2}; (2) binary alloys containing multiple oxidation state actinides (particularly uranium) and nonactinide polyhedral clusters such as Be{sub 13} centered icosahedra in Ube{sub 13} and Pt{sub 6/2} octahedra in Upt{sub 3}. The f-block metals in heavy fermion superconductors not only exhibit multiple oxidation states but are also diluted enough by the other elements so that the separation between f-block metals in the structure is at least 4 {angstrom}. The f-block metals become part of the conducting skeletons of heavy fermion superconductors so that their conductivities arise at least partially through valence fluctuations involving f-electrons.

• OSTI ID: 576442
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 131; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTINIDES
CARBIDES
CERIUM BORIDES
CERIUM SILICIDES
COPPER SILICIDES
RUBIDIUM SILICIDES
SUPERCONDUCTORS
VALENCE