| Autor: |
MacLaughlin De, Bucher E, Vithayathil Jp, Koster E, Williams Dl |
| Rok vydání: |
1991 |
| Předmět: |
|
| Zdroj: |
Physical review. B, Condensed matter. 44(9) |
| ISSN: |
0163-1829 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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