Superconductivity and Quantum Oscillations in Crystalline Bi Nanowire

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• 作者：Mingliang Tian ; Jian Wang ; Qi Zhang ; Nitesh Kumar ; Thomas E. Mallouk ; Moses H. W. Chan
• 刊名：Nano Letters
• 出版年：2009
• 出版时间：September 9, 2009
• 年：2009
• 卷：9
• 期：9
• 页码：3196-3202
• 全文大小：326K
• 年卷期：v.9,no.9(September 9, 2009)
• ISSN：1530-6992

文摘

While bulk bismuth (Bi) is a semimetal, we have found clear evidence of superconductivity in 72 nm diameter crystalline Bi nanowire below 1.3 K. In a parallel magnetic field (H), the residual resistance of the nanowire below T_c displays periodic oscillations with H, and the period corresponds to a superconducting flux quantum. This result indicates that the superconductivity originates from the cylindrical shell between Bi inner core and the surface oxide layer. Under a perpendicular H, the resistance in the superconducting state shows Shubnikov−de Haas (SdH)-like oscillations, a signature of a normal metal. These results suggest a novel coexistence of superconducting and metallic states in the temperatures well below T_c.