Isotropic single-gap superconductivity of elemental Pb
Rustem Khasanov, Debarchan Das, Dariusz Jakub Gawryluk, Ritu Gupta, Charles Mielke, III
DOI 10.1103/PhysRevB.104.L100508 · Physical Review B
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Abstract
The unconventional multigap superconductivity in elemental Pb were reported previously by the surface sensitive tunneling experiments as well as predicted by several theory works. To obtain bulk evidence for such multiple gap behavior, the thermodynamic critical-field Bc was measured along three different crystallographic directions ([100], [110], and [111]) in a high-quality Pb single crystal by means of muon spin rotation/relaxation. No difference in temperature evolution of Bc for all three directions was detected. The average reduced gap α=Δ/kBTc=2.312(3) (Δ is the zero-temperature gap value, and Tc is the transition temperature) was further obtained by employing the phenomenological α model. Our results imply that the elemental Pb is an isotropic superconductor with a single energy gap.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.191 | Pressure unresolved | unknown |
| Hg Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | unknown |
| Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | unknown |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.2 | Pressure unresolved | unknown |
| AuBe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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