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[1].·ÑÂüÖø£¬¡¶ÎïÀí¶¨Âɵı¾ÐÔ¡·£¬ºþÄÏ¿Æѧ¼¼Êõ³ö°æÉ磬2012Äê9Ô£¬214Ò³
[2].Yong Tao, Scaling Laws for Thin Films near the Superconducting-to-InsulatingTransition. Scientific Reports, DOI: 10.1038/srep23863 (2016).
[3].Gorkov, L. P. Microscopic derivation of the Ginzburg-Landau equations in thetheory of superconductivity. Soviet Phys. JETP 9, 1364¨C1367 (1959)
[4].Ivry, Y. et al. Universal scaling of the critical temperature for thin filmsnear the superconducting-to-insulating transition. Phys. Rev. B 90, 214515 (2014)
[5].Hetel, I. et al. Quantum critical behaviour in the superfluid density ofstrongly underdoped ultrathin copper oxide films. Nature physics 3, 700-702 (2007)
[6].Bollinger, A. T. et al. Superconductor¨Cinsulator transition in La2-xSrxCuO4 atthe pair quantum resistance. Nature 472,458-460 (2011)
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