{sup 209}Bi NMR in heavy-electron system YbBiPt

Conference · Wed Jun 01 00:00:00 EDT 1994

OSTI ID:10157841

Reyes, A P; Le, L P; Heffner, R H; Ahrens, E T; Fisk, Z; Canfield, P C

Bismuth NMR Knight shift and spin lattice relaxation rate 1/T{sub 1} are reported between 35--325K in the low-carrier heavy fermion system YbBiPt. The Knight shift is strongly temperature dependent and negative. Its temperature dependence tracks the bulk susceptibility with a hyperfine coupling constant A{sub hf} = {minus}7.89 kOe/{mu}B. At low temperatures 1/T{sub 1} exhibits a dramatic increase, such that the average 4f spin correlation time {tau}{sub f} shows a crossover behavior at about 75K. The rate 1/{tau}{sub f} is proportional to temperature, but with a different proportionality constant above and below about 75K. The linear temperature dependence is consistent with non-interacting 4f local moments which are relaxed via Korringa-type scattering with the conduction electrons. Below 75K, we infer that the reduced thermal excitation of a higher crystal-field multiplet is responsible for the dramatic decrease in the rate of 4f relaxation.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 10157841
• Report Number(s): LA-UR-94-1864; CONF-940863-1; ON: DE94013134; TRN: 94:012941
• Resource Relation: Conference: International conference on strongly correlated electron systems,Amsterdam (Netherlands),15-18 Aug 1994; Other Information: PBD: [1994]
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BISMUTH 209
NUCLEAR MAGNETIC RESONANCE
SPIN-LATTICE RELAXATION
ELECTRON CORRELATION
KNIGHT SHIFT
YTTERBIUM ALLOYS
PLATINUM ALLOYS
BISMUTH ALLOYS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
663110
GENERAL AND AVERAGE PROPERTIES OF NUCLEI AND NUCLEAR ENERGY LEVELS