期刊
NANO LETTERS
卷 15, 期 2, 页码 1410-1413出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl5048175
关键词
Metal nanoclusters; superconducting pairing; electronic shell structure; photoionization and photoemission spectroscopy
类别
资金
- U.S. National Science Foundation [DMR-1206334]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1206334] Funding Source: National Science Foundation
A unique property of size-resolved metal nanocluster particles is their superatom-like electronic shell structure. The shell levels are highly degenerate, and it has been predicted that this can enable exceptionally strong superconducting-type electron pair correlations in certain clusters composed of just tens to hundreds of atoms. Here we report on the observation of a possible spectroscopic signature of such an effect. A bulge-like feature appears in the photoionization yield curve of a free cold aluminum cluster and shows a rapid rise as the temperature approaches approximate to 100 K. This is an unusual effect, not previously reported for clusters. Its characteristics are consistent with an increase in the effective density of states accompanying a pairing transition, which suggests a high-temperature superconducting state with T-c >= 100 K. Our results highlight the promise of metal nanoclusters as high-Tc building blocks for materials and networks.
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