Electronic heat capacity of the strongly exchange-enhanced metal USn/sub 3/
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
An analysis of the phonon heat capacity of USn/sub 3/ is presented. This analysis is used to obtain the temperature dependence of the electronic heat-capacity coefficient, ..gamma..(T) = C/sub e//T. It is found that ..gamma..(T) decays smoothly from ..gamma../sub 0/ = 171 mJ/mol K/sup 2/ in the low-temperature limit to 24 mJ/mol K/sup 2/ at T = 30 K and asymptotically approaches approx.20 mJ/mol K/sup 2/. Band-structure calculations indicate a virtually temperature independent ..gamma../sub BS/ of about 22 mJ/mol K/sup 2/. Thus the experimental ..gamma..(T) approaches ..gamma../sub BS/ by about 30 K. The departure of the experimental curve below approx.30 K is most likely due to the onset of spin fluctuations. These fluctuations are local in nature since the area between the band and experimental ..gamma.. curves up to 30 K is equal to 0.36R ln2. An analysis of new heat-capacity data below 10 K can be made consistent with the existence of a T/sup 3/lnT term, but subtraction of a realistic phonon heat-capacity contribution removes this term. The implication that this observation has on other spin fluctuators and heavy-fermion compounds is discussed.
- Research Organization:
- Materials Science and Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5602357
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 33:12; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACTINIDE ALLOYS
ALLOYS
ELECTRONIC SPECIFIC HEAT
ELECTRONIC STRUCTURE
EXCHANGE INTERACTIONS
INTERACTIONS
LOW TEMPERATURE
MEDIUM TEMPERATURE
PHONONS
PHYSICAL PROPERTIES
QUASI PARTICLES
SPECIFIC HEAT
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TIN ALLOYS
ULTRALOW TEMPERATURE
URANIUM ALLOYS
VERY LOW TEMPERATURE
360104* -- Metals & Alloys-- Physical Properties
ACTINIDE ALLOYS
ALLOYS
ELECTRONIC SPECIFIC HEAT
ELECTRONIC STRUCTURE
EXCHANGE INTERACTIONS
INTERACTIONS
LOW TEMPERATURE
MEDIUM TEMPERATURE
PHONONS
PHYSICAL PROPERTIES
QUASI PARTICLES
SPECIFIC HEAT
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TIN ALLOYS
ULTRALOW TEMPERATURE
URANIUM ALLOYS
VERY LOW TEMPERATURE