Signature of superconductivity in UBe13 as seen by neutron scattering: Superconducting and magnetic energy scales

A. Hiess; A. Schneidewind; O. Stockert; Z. Fisk

doi:10.1103/PhysRevB.89.235118

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Signature of superconductivity in UBe13 as seen by neutron scattering: Superconducting and magnetic energy scales

A. Hiess, A. Schneidewind, O. Stockert, Z. Fisk

DOI 10.1103/PhysRevB.89.235118 · Physical Review B

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Abstract

We here present inelastic neutron scattering results on the strongly correlated cubic superconductor UBe13 (Tc = 0.85 K) obtained on a large single crystal by high-resolution cold neutron three-axis spectroscopy. We observed spin dynamics at a unique momentum space position building up below T∼50 K and changing significantly on entering the superconducting state. The observed short-range longitudinal character of the correlations can be understood as a result of competing magnetic interactions. The energy dependence in the normal state reflects the energy scales determined from specific heat, whereas the low-temperature data suggest the opening of a superconducting gap. Our findings are consistent with a superconducting order parameter exhibiting s± or d-wave symmetry and placing pure UBe13 in the strong coupling regime.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.85	Pressure not reported	onset
UBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.85	Pressure not reported	unknown