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

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:7202248

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 higher-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 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. The magnetic properties of narrow-band metals ranging from heavy fermions to spin-fluctuation compounds to mixed-valence materials are displayed in the series Ce(Pt/sub 1-x/Ni/sub x/) Si. 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.

• Research Organization: Iowa State Univ. of Science and Technology, Ames (USA)
• OSTI ID: 7202248
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
CERIUM ALLOYS
CERIUM BASE ALLOYS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC SPECIFIC HEAT
FERMIONS
KONDO EFFECT
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
NICKEL ALLOYS
PHYSICAL PROPERTIES
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
RARE EARTH ALLOYS
SILICON ALLOYS
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES