Point-contact spectra of the heavy-fermion superconductors UBe13 and UPt3
A. Nowack, A. Heinz, F. Oster, D. Wohlleben, G. Güntherodt, Z. Fisk, A. Menovsky
DOI 10.1103/PhysRevB.36.2436 · Physical Review B
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Abstract
We have measured the current-voltage characteristics of point contacts between UBe13 or UPt3 and the normal metals W or Pt (metallic point contacts) or GaAs (Schottky-barrier tunneling contact) in the temperature range between 50 mK and 1 K. In the metal-point-contact characteristics (dVdI vs V) there appear zero-bias minima of width 2Δ below Tc. The ratio 2ΔkBTc is close to the BCS value. The tunneling spectra of UPt3 exhibit weak additional structure below Tc. A value 2Δ has been estimated, which is a factor of 2 larger than that for the metal point contacts.
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. | 0.89 | Pressure not reported | onset |
| UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.46 | Pressure not reported | onset |
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