Andreev reflections on heavy-fermion superconductors

Y. De Wilde; J. Heil; A. G. M. Jansen; P. Wyder; R. Deltour; W. Assmus; A. Menovsky; W. Sun; L. Taillefer

doi:10.1103/PhysRevLett.72.2278

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Andreev reflections on heavy-fermion superconductors

Y. De Wilde, J. Heil, A. G. M. Jansen, P. Wyder, R. Deltour, W. Assmus, A. Menovsky, W. Sun, L. Taillefer

DOI 10.1103/PhysRevLett.72.2278 · Physical Review Letters

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Abstract

In a comparative Andreev-reflection study of normal-superconductor point contacts on the c plane of UPt3, CeCu2Si2, and URu2Si2 crystals at temperatures down to T=30 mK and in a magnetic field up to B=10 T, differences are found in the current-voltage characteristics. The behavior of the differential resistance dV/dI(V) of UPt3 is attributed to the presence of nodes in the superconducting order parameter Δ(k^) and is compared with theoretical predictions for the symmetry of the pairing state. The data for CeCu2Si2 and URu2Si2 point to the absence of zeros in Δ(k^).

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.	0.44	Pressure not reported	unknown
CeCu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.63	Pressure not reported	unknown
URu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1	Pressure not reported	unknown