Test of the equivalence principle for superconductors
M. P. Ross, S. M. Fleischer, I. A. Paulson, P. Lamb, B. M. Iritani, E. G. Adelberger, C. A. Hagedorn, K. Venkateswara, C. Gettings, E. A. Shaw, S. K. Apple, J. H. Gundlach
DOI 10.1103/PhysRevD.111.L021101 · Physical Review D
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Abstract
We searched for violations of the weak equivalence principle using a cryogenic torsion balance with a pendulum comprised of superconducting niobium and copper. We constrain the Eötvös parameter with 95% confidence to ηNb*−Cu≤2.0×10−9 and ηCP−ee≤9.2×10−4 for superconducting niobium and Cooper pairs, respectively.
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. | 9 | Pressure not reported | unknown |
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