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arXiv 0903.2855cond-mat.mes-hallcond-mat.supr-con
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Bi纳米线的超导电性和量子振荡

Superconductivity and quantum oscillations in crystalline Bi nanowires

Mingliang Tian, Jian Wang, Qi Zhang, Nitesh Kumar, Thomas E. Malouk, Moses H. W. Chan

摘要:

虽然大块铋(Bi)是一种半金属,但我们已经在1.3 K以下的72 nm直径的晶体Bi纳米线中发现了超导性的明显证据。在平行磁场(H)中,纳米线在Tc以下的剩余电阻表现出随H的周期振荡,周期对应于超导通量量子。这一结果提供了超导电性来自Bi与表面氧化物之间的界面壳层的证据。在垂直的H中,超导状态下的电阻显示出舒布尼科夫-德哈斯(SdH)振荡,这是正常金属的特征。这些结果表明在纳米线的表面壳层中存在玻色子态和费米子态的共存。

英文摘要:

While bulk bismuth (Bi) is a semimetal, we have found clear evidence of superconductivity in a crystalline 72 nm diameter Bi nanowire below 1.3 K. In a parallel magnetic field (H), the residual resistance of the nanowire below Tc displays periodic oscillations with H, and the period corresponds to the superconducting flux quantum. This result provides evidence that the superconductivity comes from the interface shell between Bi and the surface oxide. In a perpendicular H, the resistance in the superconducting state shows Shubnikov-de Haas (SdH) oscillations, a signature of a normal metal. These results indicate a novel coexistence of Bosonic and Fermionic states in the surface shell of nanowires.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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