Spin fluctuations and anisotropic nuclear relaxation in single-crystal UPt sub 3

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

DOI:https://doi.org/10.1103/PhysRevB.44.4705· OSTI ID:5163966

Vithayathil, J P; MacLaughlin, D E ^[1]; Koster, E; Williams, D L ^[2]; Bucher, E ^[3]

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1. University of California, Riverside, California (USA)
2. University of British Columbia, Vancouver, British Columbia (Canada)
3. University of Konstanz, D-7760 Konstanz (Federal Republic of Germany)

The anisotropy and temperature dependence of the {sup 195}Pt spin-lattice relaxation rate {ital T} {sub 1}{sup {minus}1} have been measured in a single crystal of the heavy-fermion compound UPt{sub 3}. Between 1.5 and 4.2 K {ital T} {sub 1}{sup {minus}1} is proportional to temperature. The observed anisotropy {ital T} {sub 1( )}{sup {minus}1}/{ital T} {sub 1{perpendicular}}{sup {minus}1}=1.7{plus minus}0.1, together with the nearly isotropic {sup 195}Pt hyperfine field, imply that the spin fluctuations are predominantly in the basal plane. The Korringa product is close to the value expected for a noninteracting Fermi gas, which indicates that the relaxation is not enhanced by antiferromagnetic (AFM) fluctuations. The effective fluctuation rates derived from these NMR data (9{plus minus}1 meV) and from inelastic neutron scattering by AFM fluctuations are similar, indicating that a rate of this order characterizes a range of fluctuation wave vectors.

• OSTI ID: 5163966
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:9; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTINIDE ALLOYS
ALLOYS
ANISOTROPY
CRYSTALS
DAYS LIVING RADIOISOTOPES
EVEN-ODD NUCLEI
FLUCTUATIONS
HEAVY NUCLEI
INTERMETALLIC COMPOUNDS
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MONOCRYSTALS
NUCLEI
PLATINUM 195
PLATINUM ALLOYS
PLATINUM ISOTOPES
PLATINUM METAL ALLOYS
RADIOISOTOPES
RELAXATION
SPIN-LATTICE RELAXATION
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
ULTRALOW TEMPERATURE
URANIUM ALLOYS
VARIATIONS