Determination of the Cooper-pair mass in niobium
J. Tate, S. B. Felch, B. Cabrera
DOI 10.1103/PhysRevB.42.7885 · Physical Review B
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Abstract
We have measured the ratio of Planck’s constant h to the observable mass m’ of a Cooper pair in a superconductor, using a rotating superconducting ring. The flux through such a ring of area S is zero for a set of rotation frequencies evenly spaced by Δν and h/2πm’=2SΔν. Our measurements of S and Δν enable us to quote a value of m’/2me for niobium of 1.000 084 (21). This result disagrees with predictions from currently available theories.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb 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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