Suppression of spin fluctuations by alloying in UPt3 |
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Authors: | G R Stewart A L Giorgi |
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Affiliation: | (1) Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico |
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Abstract: | In order to investigate the normal state spin fluctuation behavior of UPt3, we have measured the low temperature resistivity and specific heat C of U(Pt0.8Pd0.2)3, which we find to be close to the phase stability boundary for the hexagonal UPt3 structure. The evidence for spin fluctuations observed in UPt3, aT
3 ln (T/T
SF) upturn inC/T below 10 K, is totally suppressed in U(Pt0.8Pd0.2)3, and the value, proportional to the dressed density of states, is decreased by 50% compared to pure UPt3. This extreme sensitivity to substitution by isoelectronic Pd for Pt indicates that the spin fluctuations in UPt3 depend critically on the hybridization of the U electrons, U-U separation equal to 4.2 Å, with the electrons of the intervening atoms. |
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