Pressure Dependence of Spin-Fluctuation Effects in the Specific Heat of the Heavy-Fermion Superconductor UPt3

G. E. Brodale; R. A. Fisher; Norman E. Phillips; G. R. Stewart; A. L. Giorgi

doi:10.1103/PhysRevLett.57.234

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Pressure Dependence of Spin-Fluctuation Effects in the Specific Heat of the Heavy-Fermion Superconductor UPt3

G. E. Brodale, R. A. Fisher, Norman E. Phillips, G. R. Stewart, A. L. Giorgi

DOI 10.1103/PhysRevLett.57.234 · Physical Review Letters

T1

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Abstract

UPt3 is a heavy-fermion superconductor with indications of coexisting long-range ferromagnetic spin fluctuations. Measurements of its specific heat at pressures of 0, 3.8, and 8.9 kbar between 0.35 and 20 K show that the spin-fluctuation terms are extremely sensitive to pressure: The linear term decreases by ∼ 25% at 8.9 kbar; the T3 and T3lnT terms decrease by factors of the order of 4. Comparison with the pressure dependence of the critical temperature suggests that the superconductivity is of a form that is enhanced by spin fluctuations.

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	0.38 GPa	onset
UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.36	0.89 GPa	onset