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 {Δ}{ν} and h/2{π}m'=2S{Δ}{ν}. Our measurements of S and {Δ}{ν} 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.
No takes yet. Share an insight, caveat, or question.
Tate et al. (1990) studied this question.
Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context: