Pressure dependence of the superconducting phases in UPt sub 3

Journal Article · Sat Jun 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.13714· OSTI ID:5692457

Trappmann, T; Loehneysen, H v ^[1]; Taillefer, L ^[2]

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1. Physikalisches Institut der Universitaet Karlsruhe, D-7500 Karlsruhe, Federal Republic of Germany (DE)
2. Centre des Recherches sur Tres Basses Temperatures, CNRS, F-38042 Grenoble CEDEX, France (FR)

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.

• OSTI ID: 5692457
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:16; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACTINIDE COMPOUNDS
ANTIFERROMAGNETISM
COMPOSITE MATERIALS
DIAGRAMS
MAGNETISM
MATERIALS
PHASE DIAGRAMS
PHYSICAL PROPERTIES
PLATINUM COMPOUNDS
PRESSURE DEPENDENCE
SPECIFIC HEAT
SUPERCONDUCTING COMPOSITES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
URANIUM COMPOUNDS
VERY HIGH PRESSURE