Evidence for Berezinskii-Kosterlitz-Thouless transition in atomically flat two-dimensional Pb superconducting films

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• 作者：Weiwei Zhao^a ; ^b ; ^c ; Qingyan Wang^a ; ^b ; Minhao Liu^b ; Wenhao Zhang^a ; ^b ; Yilin Wang^a ; Mu Chen^b ; Yang Guo^a ; Ke He^a ; Xi Chen^b ; Yayu Wang^b ; Jian Wang^c ; ^d ; Xincheng Xie^d ; Qian Niu^d ; Lili Wang^a ; ^{llwang@iphy.ac.cn} ; Xucun Ma^a ; Jainendra K. Jain^c ; M.H.W. Chan^c ; Qi-Kun Xue^a ; ^b ; ^{qkxue@mail.tsinghua.edu.cn}
• 关键词：A. Crystalline lead films ; B. BKT transition ; C. Scanning tunneling microscopy ; D. Transport measurement
• 刊名：Solid State Communications
• 出版年：2013
• 出版时间：July, 2013
• 年：2013
• 卷：165
• 期：Complete
• 页码：59-63
• 全文大小：650 K

文摘

We report results from scanning tunneling microscopy and transport measurements on a series of crystalline lead films containing an integer number of atomic layers, and find that the observed features in sufficiently thin films are consistent with Berezinskii-Kosterlitz-Thouless (BKT) physics. Specifically, Cooper pairing and superconductivity disappear at two distinct temperatures; the current-voltage characteristics in the intermediate phase are non-Ohmic; and the temperature and current dependences of resistance agree with the expectation from the BKT theory.