Abstract
We report measurements of the specific heat of the heavy-fermion compound UPt{sub 3} under hydrostatic pressure {ital p} up to 4.5 kbar. The two superconductive transitions at temperatures {ital T}{sub {ital c}}{sup +} and {ital T}{sub {ital c}}{sup {minus}} observed previously under zero pressure decrease at a rate of {ital dT}{sub {ital c}}{sup +}/{ital dp}={minus}24 mK/kbar and {ital dT}{sub {ital c}}{sup {minus}}/{ital dp}={minus}5 mK/kbar. The transitions merge at {ital p}{sup *}=3.7 kbar and {ital T}{sup *}=419 mK. These results suggest that the weak antiferromagnetic order, which is suppressed on the same pressure scale, acts as a symmetry-breaking field in splitting the superconductive transition, thus yielding convincing evidence for a non-BCS order parameter for this system.
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