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Novel voltage signal at proximity-induced superconducting transition temperature in gold nanowires |
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| Authors: | Jian Wang ZiQiao Wang Yi Sun QingFeng Sun Moses H. W. Chan |
| Affiliation: | 1.International Center for Quantum Materials, School of Physics,Peking University,Beijing,China;2.Collaborative Innovation Center of Quantum Matter,Beijing,China;3.State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics,Tsinghua University,Beijing,China;4.Department of Physics,The Pennsylvania State University,Pennsylvania,USA;5.CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing,China |
| Abstract: | 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. |
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