Antiferromagnetic order in UPt3 under pressure: Evidence for a direct coupling to superconductivity

S. M. Hayden; L. Taillefer; C. Vettier; J. Flouquet

doi:10.1103/PhysRevB.46.8675

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Antiferromagnetic order in UPt3 under pressure: Evidence for a direct coupling to superconductivity

S. M. Hayden, L. Taillefer, C. Vettier, J. Flouquet

DOI 10.1103/PhysRevB.46.8675 · Physical Review B

T1

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Abstract

We use neutron diffraction to study the effect of hydrostatic pressure on the ordered antiferromagnetic moment in the heavy-fermion superconductor UPt3. It is found that hydrostatic pressure suppresses and eventually destroys the antiferromagnetic order. A comparison of our results with specific-heat measurements made under hydrostatic pressure shows that the splitting of the two anomalies in the low-temperature heat capacity correlates well with the collapse in the magnitude of the ordered moment. This suggests a coupling between the superconducting and antiferromagnetic order parameters.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.5	Pressure unresolved	onset
UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.44	Pressure unresolved	onset