Anisotropy in the thermal expansion of heavy-fermion UPt3 at the superconducting transition
A. de Visser, A. A. Menovsky, J. J. M. Franse, K. Hasselbach, A. Lacerda, L. Taillefer, P. Haen, J. Flouquet
DOI 10.1103/PhysRevB.41.7304 · Physical Review B
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Abstract
We have measured the coefficients of linear thermal expansion (α? and α⊥) of two single-crystalline samples of heavy-fermion UPt3 down to temperatures well below the superconducting transition (Tc≃0.5 K). The thermal expansion is strongly anisotropic at Tc, where only α? has a discontinuity. This implies that Tc is suppressed for a uniaxial stress along the hexagonal axis only. In the superconducting phase α? and α⊥ vary approximately quadratically, with temperature, as does the specific heat. The Grüneisen parameter shows a large drop at Tc; from 69 in the normal phase to -10 in the superconducting phase.
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 not reported | onset |
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