Novel voltage signal at proximity-induced superconducting transition temperature in gold nanowires

• 来源期刊: 中国科学:物理学 力学 天文学（英文版）
• 年，卷（期）: 2018,（8）
• 页码范围: 69-74
• 页数: 6页
• 语种: 英文

摘要

We observed a novel voltage peak in the proximity-induced superconducting gold (Au) nanowire while cooling the sample through the superconducting transition temperature.The voltage peak turned dip during warming.The voltage peak or dip was found to originate respectively from the emergence or vanishing of the proximity-induced superconductivity in the Au nanowire.The amplitude of the voltage signal depends on the temperature scanning rate,and it cannot be detected when the temperature is changed slower than 0.03 K/min.This transient feature suggests the non-equilibrium property of the effect.Ginzburg-Landau model clarified the voltage peak by considering the emergence of Cooper pairs of relatively lower free energy in superconducting W contact and the non-equilibrium diffusion of Cooper pairs and quasiparticles.