Investigation of heavy fermion and dense Kondo systems in Ce-based ternary silicides

Technical Report · Mon Jun 01 04:00:00 EDT 1987

OSTI ID:6359726

Lee, W H

Measurements of the magnetic contribution to the electric resistivity, static magnetic susceptibility, and low temperature heat capacity of CePtSi are reported in this work. A logarithmic increase of magnetic resistivity is observed with the decrease of temperature in the high temperature region. This is one of the characteristic features of dense Kondo system. This compound has a large value of the low temperature magnetic susceptibility (chi/sub m/(2.4K) = 24.9 x 10/sup -3/ cm/sup 3//mol) and, characteristic of heavy fermion compounds, an enormous coefficient of the electronic specific heat, ..gamma.. approx. 800 mJ/mol K/sup 2/. ac magnetic susceptibility measurements indicate that this compound neither orders magnetically nor is superconducting above 70 mK. To understand the nature and mechanism of the heavy fermion compound CePtSi, a number of isostructural pseudoternary systems are investigated by studying the variations of lattice parameters, static magnetic susceptibility and magnetic contribution to the resistivity. Lastly, the semi-heavy fermion system CeSi/sub x/ (1.60 less than or equal to x less than or equal to 1.90) is examined. The rapid decrease of the magnetic ordering temperatures resulting in a nonmagnetic state as the f-f atomic separations increase in the region 1.80 less than or equal to x less than or equal to 1.90, indicates that f-ligand hybridization is the dominant mechanism of f-electron delocalization in this system. 116 refs., 13 figs., 5 tabs.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6359726
• Report Number(s): IS-T-1279; ON: DE87010932
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CERIUM COMPOUNDS
COMPOSITE MATERIALS
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
INFORMATION
KONDO EFFECT
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MATERIALS
NUMERICAL DATA
PHYSICAL PROPERTIES
PLATINUM COMPOUNDS
RARE EARTH COMPOUNDS
SILICON COMPOUNDS
SUPERCONDUCTING COMPOSITES
TRANSITION ELEMENT COMPOUNDS