Spectroscopic Evidence for Unconventional Superconductivity in UBe13
Ch. Wälti, H. R. Ott, Z. Fisk, J. L. Smith
DOI 10.1103/PhysRevLett.84.5616 · Physical Review Letters
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Abstract
We report on measurements of the differential conductivity G of UBe13–Au contacts, which reveal the existence of low-energy Andreev surface bound states. These bound states are identified via huge conductance peaks at zero bias that may form only in superconductors with nontrivial energy-gap functions. From the voltage dependence of G at T<Tc we also establish a lower limit of the normalized energy gap, such that 2Δ(0)kBTc>6.7, much in excess of the weak coupling BCS value of 3.5, and directly indicating strong coupling effects in superconducting UBe13.
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. | 0.905 | Pressure not reported | onset |
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