CeCu sub 4 Al and CeCu sub 2 Zn sub 2 Al: Very-heavy-fermion systems in high magnetic fields

Journal Article · Sun Sep 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.44.4371· OSTI ID:5207725

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

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1. Department of Physics, University of Florida, Gainesville, Florida (USA)
2. Los Alamos National Laboratory, Los Alamos, New Mexico (USA)

CeCu{sub 4}Al and CeCu{sub 2}Zn{sub 2}Al are heavy-fermion systems with extremely enhanced {ital C}/{ital T} (the specific heat divided by temperature) values of 2.3 and 1.8 J/K{sup 2}, respectively, as {ital T}{r arrow}0 K. The field dependence of the low-temperature specific heat is also extreme: At 11 T, {ital C} of CeCu{sub 4}Al is reduced by more than a factor of 5 and at 12.5 T, {ital C} of CeCu{sub 2}Zn{sub 2}Al is suppressed by a factor of about 7. Magnetic-field-caused changes of the specific heat of CeCu{sub 4}Al 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}Al.

• DOE Contract Number: FG05-86ER45268
• OSTI ID: 5207725
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:9; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ABSOLUTE ZERO TEMPERATURE
ALLOYS
ALUMINIUM ALLOYS
CERIUM ALLOYS
COPPER ALLOYS
COPPER BASE ALLOYS
ELEMENTARY PARTICLES
FERMIONS
HEAVY LEPTONS
KONDO EFFECT
LEPTONS
MAGNETIC FIELDS
PHYSICAL PROPERTIES
POSTULATED PARTICLES
RARE EARTH ALLOYS
SPECIFIC HEAT
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
ULTRALOW TEMPERATURE
ZINC ALLOYS