A study off-electrons behavior in Ce-based intermetallics with the Cu sub 3 Au structure

Miscellaneous · Sun Jan 01 00:00:00 EST 1989

OSTI ID:5944135

Rahman, S

The author has measured the thermodynamic and transport properties of new system CeTi{sub 3} and then alloying Tl with Pb, Sn and In to see how the f-electrons behavior evolves as one goes in between two radically different ground states. The measurements include the room temperature lattice constant, magnetic susceptibility, specific heat and electrical resistivity of the pseudobinary alloys Ce(Tl{sub 1-x}Pb{sub x}){sub 3}, Ce(Tl{sub 1-x}Sn{sub x}){sub 3} and Ce(Tl{sub 1-x}In{sub x}){sub 3}, where 0 {le} x {le} 1. The results are summarized as follows. The data strongly suggests that CeTl{sub 3} orders antiferromagnetically at {approximately}3.8K. The Ce-ions are in the trivalent state with well localized magnetic moments corresponding to the Hund's rule J = 5/2 spin orbit ground multiplet with {mu} = 2.55{mu}{sub {beta}}. The J = 5/2 multiplet is split by the cubic crystalline field into a {Gamma}{sub 7}-ground doublet and an excited {Gamma}s-quartet, the splitting energy being of the order of 100K to 150K. The properties of CeTl{sub 3} are found to be similar to those of CeIn{sub 3} except that the Kondo scattering in CeTl{sub 3} is much weaker than CeIn{sub 3}. In Ce(Tl{sub 1-x}Pb{sub x}){sub 3} alloy, the electronic specific heat coefficient above Neel temperature increases as x increases. The {gamma}HT reaches 431 mJ/mole-K{sup 2} for x = 0.6. This indicates that the localized f- electron antiferromagnetic behavior is driven to an itinerant heavy fermion antiferromagnetic one. Also the Neel temperature has nonmonotonic variation with Pb concentration. Here we found a striking similarity with the previously studied Ce(In{sub 1-x}Pb{sub x}){sub 3} system regarding T{sub N} and {gamma}HT behavior except that we do not see a concentration range for which T{sub N} = 0 as is observed in Ce(In{sub 1-x}Pb{sub x}){sub 3} system.

• Research Organization: Temple Univ., Philadelphia, PA (USA)
• OSTI ID: 5944135
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM ALLOYS
PHYSICAL PROPERTIES
INDIUM ALLOYS
LEAD ALLOYS
THALLIUM ALLOYS
TIN ALLOYS
AMBIENT TEMPERATURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC STRUCTURE
EXPERIMENTAL DATA
INTERMETALLIC COMPOUNDS
KONDO EFFECT
LATTICE PARAMETERS
MAGNETIC SUSCEPTIBILITY
ORDER PARAMETERS
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
ALLOYS
DATA
INFORMATION
MAGNETIC PROPERTIES
NUMERICAL DATA
RARE EARTH ALLOYS
360104* - Metals & Alloys- Physical Properties