Suppression of spin fluctuations by alloying in UPt/sub 3/

Journal Article · Mon Apr 01 04:00:00 EST 1985 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00681511· OSTI ID:5792382

Stewart, G R; Giorgi, A L

In order to investigate the normal state spin fluctuation behavior of UPt/sub 3/, we have measured the low temperature resistivity and specific heat C of U(Pt/sub 0.8/Pd/sub 0.2/)/sub 3/, which we find to be close to the phase stability boundary for the hexagonal UPt/sub 3/ structure. The evidence for spin fluctuations observed in UPt/sub 3/,aT/sup 3/ ln (T/T/sub SF/) upturn in C/T below 10 K, is totally suppressed in U(Pt/sub 0.8/Pd/sub 0.2/)/sub 3/, and the ..gamma.. value, proportional to the dressed density of states, is decreased by 50% compared to pure UPt/sub 3/. This extreme sensitivity to substitution by isoelectronic Pd for Pt indicates that the spin fluctuations in UPt/sub 3/ depend critically on the hybridization of the U electrons, U-U separation equal to 4.2 A, with the electrons of the intervening atoms.

• Research Organization: Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico
• OSTI ID: 5792382
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 59:1; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACTINIDE ALLOYS
ALLOYS
ATOMS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY-LEVEL DENSITY
EXPERIMENTAL DATA
FLUCTUATIONS
HEXAGONAL LATTICES
HYBRIDIZATION
INFORMATION
ISOELECTRONIC ATOMS
LOW TEMPERATURE
MEDIUM TEMPERATURE
NUMERICAL DATA
PALLADIUM ALLOYS
PHYSICAL PROPERTIES
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
SPECIFIC HEAT
SPIN WAVES
THERMODYNAMIC PROPERTIES
ULTRALOW TEMPERATURE
URANIUM ALLOYS
VARIATIONS
VERY LOW TEMPERATURE