Spin Uncoupling in Free Nb Clusters: Support for Nascent Superconductivity
Ramiro Moro, Shuangye Yin, Xiaoshan Xu, Walt A. de Heer
DOI 10.1103/PhysRevLett.93.086803 · Physical Review Letters
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Abstract
Molecular beam Stern-Gerlach deflection measurements on Nb clusters (NbN, N<100) show that at very low temperatures the odd-N clusters deflect due to a single unpaired spin that is uncoupled from the cluster. At higher temperatures the spin is coupled and no deflections are observed. Spin uncoupling occurs concurrently with the transition to the recently found ferroelectric state, which has superconductor characteristics [Science 300, 1265 (2003)]. Spin uncoupling (also seen in V, Ta, and Al clusters) is analogous to the reduction of spin-relaxation rates observed in bulk superconductors below Tc.
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. | 9.5 | Pressure not reported | unknown |
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