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Superconductivity modulated by quantum size effects | | Yang Guo
; Yan-Feng Zhang
; Xin-Yu Bao
; Tie-Zhu Han
; Zhe Tang
; Li-Xin Zhang
; Wen-Guang Zhu
; E G Wang
; Qian Niu
; Z Q Qiu
; Jin-Feng Jia
; Zhong-Xian Zhao
; Qi-Kun Xue
; | | Date: |
10 Dec 2004 | | Journal: | Science, 306 (5703), 1915-7 | | Abstract: | We have fabricated ultrathin lead films on silicon substrates with atomic-scale control of the thickness over a macroscopic area. We observed oscillatory behavior of the superconducting transition temperature when the film thickness was increased by one atomic layer at a time. This oscillating behavior was shown to be a manifestation of the Fabry-Perot interference modes of electron de Broglie waves (quantum well states) in the films, which modulate the electron density of states near the Fermi level and the electron-phonon coupling, which are the two factors that control superconductivity transitions. This result suggests the possibility of modifying superconductivity and other physical properties of a thin film by exploiting well-controlled and thickness-dependent quantum size effects. | | Source: | PubMed, pmid15591197 doi: 10.1126/science.1105130 | | Services: | Forum | Review | Favorites | |
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