Search for an Axionlike Spin Coupling Using a Paramagnetic Salt with a dc SQUID
Wei-Tou Ni, Sheau-shi Pan, Hsien-Chi Yeh, Li-Shing Hou, Juling Wan
DOI 10.1103/PhysRevLett.82.2439 · Physical Review Letters
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Abstract
We use a paramagnetic salt TbF3 with a dc SQUID to search for a possible axionlike σ̇r interaction of a rotating copper mass with the salt. We set new limits on the axion coupling constant gsgp/ħc and the finite-range Leitner–Okubo–Hari Dass coupling constant A. Our limit for range λ at 30 mm is 2 orders of magnitude better than previous results. For λ>30mm, gsgp/ħc is (0.14±0.67)×10−28, and A is less than 10. The outlook for further improvement is discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TbF3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.95 | Pressure not reported | unknown |
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