Investigation of conventional super-conductivity in ternary cerium compounds through high-pressure studies

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5312942

Athreya, K S

This investigation focuses on the nature and mechanism of superconductivity in the cerium-containing ternary borides and silicides: CeRu/sub 3/B/sub 2/, CeOs/sub 3/B/sub 2/, and CeRu/sub 3/Si/sub 2/. These are the only ternary cerium compounds where conventional (as opposed to heavy-fermion) superconductivity has been observed to date. The closely related crystal structures (all related to the CeCo/sub 3/B/sub 2/..sqrt.. type, P6mmm) enabled the study of the effect on superconductivity of transforming continuously from one system to the other by going across the pseudo-ternary series Ce (Ru/sub 1-x/Os/sub x/)/sub 3/B/sub 2/ and CeRu/sub 3/..sqrt.. (B/sub x/Si/sub 1-x/)/sub 2/. These pseudo-ternary systems were subjected to high external pressures using a standard hydrostatic pressure clamp for lower pressures (up to 20 kbar) and a specially designed diamond anvil cell for higher pressures (up to 66 kbar). Trends are presented for the variation of the superconducting transition temperatures with changes in external pressure. Results are also included from measurements of static magnetic susceptibility and electrical resistivity of all of the materials in the series Ce(Ru/sub 1-x/Os/sub x/)/sub 3/B/sub 2/ and CeRu/sub 3/(B/sub x/Si/sub 1-x/)/sub 2/. These provide some insight into the nature of the cerium valence in these compounds

• Research Organization: Iowa State Univ. of Science and Technology, Ames (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5312942
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
BORIDES
BORON COMPOUNDS
CERIUM BORIDES
CERIUM COMPOUNDS
CERIUM SILICIDES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
OSMIUM BORIDES
OSMIUM COMPOUNDS
PHYSICAL PROPERTIES
PRESSURE EFFECTS
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
RUTHENIUM BORIDES
RUTHENIUM COMPOUNDS
SILICIDES
SILICON COMPOUNDS
SUPERCONDUCTIVITY
TERNARY ALLOY SYSTEMS
TRANSITION ELEMENT COMPOUNDS