Precise Determination of the Cooper-Pair Mass
J. Tate, B. Cabrera, S. B. Felch, J. T. Anderson
DOI 10.1103/PhysRevLett.62.845 · Physical Review Letters
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Abstract
The ratio hm′ of Panck's constant to the observable Cooper-pair mass (∼2me) is determined directly using a rotating superconducting ring by measuring the London moment flux (2m′ce*)ωS, where S is the area bounded by the ring, in units of the flux quantum (hce*). The flux in the ring is zero for a set of rotation frequencies which are equally spaced by Δν, and hm′=2SΔν. We have measured Δν and S with a precision of 5 ppm and an accuracy of 21 ppm. Our result for niobium, (m′2me)Nb=1.000084(21), disagrees with theoretical predictions of 0.999 992.
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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