Resistive behavior and intermediate valence effects in La/sub 1-x/Ce/sub x/Pd/sub 3/ and CePd/sub 3-x/Rh/sub x/

Journal Article · Wed Feb 28 23:00:00 EST 1979 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.327156· OSTI ID:6341016

Scoboria, P; Crow, J E; Mihalisin, T

The electrical resistivity of CePd/sub 3/, La/sub 1-x/Ce/sub x/Pd/sub 3/, CeRh/sub x/Pd/sub 3-x/ and Ce Pd/sub 3+x/ systems has been measured from helium temperature to 300 K. The resistivity of pure CePd/sub 3/ rises from 125 ..mu.. ..cap omega.. cm to 150 ..mu.. ..cap omega.. cm as one cools from 300 K to 100 K. Below 100 K the resisitivity drops dramatically to 10 ..mu.. ..cap omega.. cm at low temperatures. The same qualitative behavior, though less pronounced, is observed in other systems such as CeSn/sub 3/ which like CePd/sub 3/ are believed to be of intermediate valence. For x<0.3 the system La/sub 1-x/Ce/sub x/Pd/sub 3/ is believed to be trivalent. We observe Kondo-like behavior in this regime. For x near unity we observe that extremely small amounts of La eliminate the rapid fall in resistivity observed below 100 K for pure CePd/sub 3/. These results suggest that this fall off is due to some type of cooperative Ce ion hehavior. The CeRh/sub x/Pd/sub 3-x/ system allows one to monitor the effect on resistivity of varying the Ce valence from 3.45 in CePd/sub 3/ to 4 in CeRh/sub .64/Pd/sub 2.36/. We find that the magnitude of the resistivity rise (upon cooling from 300 K to low temperature) decreases as the Ce valence increases towards four.

• Research Organization: Department of Physics, Temple University, Philadelphia, Pennsylvania 19122
• OSTI ID: 6341016
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 50:B3; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals &amp; Alloys-- Physical Properties
ALLOYS
CERIUM ALLOYS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
KONDO EFFECT
LANTHANUM ALLOYS
PALLADIUM ALLOYS
PALLADIUM BASE ALLOYS
PHYSICAL PROPERTIES
PLATINUM METAL ALLOYS
RARE EARTH ALLOYS
RHODIUM ALLOYS
TEMPERATURE DEPENDENCE
VALENCE