CeCu sub 4 A ell and CeCu sub 2 Zn sub 2 A ell : Very heavy fermion systems in high magnetic fields

Technical Report · Mon Jan 01 04:00:00 EST 1990

DOI:https://doi.org/10.2172/5846092· OSTI ID:5846092

Andraka, B; Kim, J S ^[1]; Stewart, G R ^[2]; Fisk, Z ^[3]

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1. Florida Univ., Gainesville, FL (United States). Dept. of Physics
2. Florida Univ., Gainesville, FL (United States). Dept. of Physics Augsburg Univ. (Germany)
3. Los Alamos National Lab., NM (United States)

CeCu{sub 4}A{ell} and CeCu{sub 2}Zn{sub 2}A{ell} are heavy fermion systems with extremely enhanced C/T (specific heat divided by temperature) values of 2.3 and 1.8 J/K{sup 2} respectively as T {yields} 0 K. The field dependence of the low temperature specific heat is also extreme; 11 T reduces C of CeCu{sub 4}A{ell} by more than a factor of five, 12.5 T suppresses C of CeCu{sub 2}Zn{sub 2}A{ell} about seven times. Magnetic field caused changes of the specific heat of CeCu{sub 4}A{ell} are consistent with a single ion Kondo model. Magnetic correlations are at least partially responsible for the enhanced low temperature specific heat of CeCu{sub 2}Zn{sub 2}A{ell}.

• Research Organization: Florida Univ., Gainesville, FL (United States). Dept. of Physics
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG05-86ER45268
• OSTI ID: 5846092
• Report Number(s): DOE/ER/45268-19; ON: DE92008518
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
665000 -- Physics of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ALUMINIUM ALLOYS
CERIUM ALLOYS
COPPER ALLOYS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
INTERMETALLIC COMPOUNDS
KONDO EFFECT
MAGNETIC FIELDS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SPECIFIC HEAT
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
ZINC ALLOYS