Experiment and Arnold Theory Analysis of Excess Current due to Andreev Reflection

Shigeru YOSHIMORI; Wataru NAKAHAMA; Mitsuo KAWAMURA

Experiment and Arnold Theory Analysis of Excess Current due to Andreev Reflection

Shigeru YOSHIMORI, Wataru NAKAHAMA, Mitsuo KAWAMURA

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Experimental results of an N-S junction and analysis of the results using the Arnold theory were reported. Au and Pb were employed as a normal metal and a superconducting material, respectively. The excess current effect due to the Andreev reflection was observed in the current-voltage characteristics of an N-S junction whose normal resistance was 1.603 Ω. The excess current at 4.62 K was about 0.7 mA when the applied voltage was 2 mV. The barrier height and width were estimated to be 1.0169 eV and 0.7 , respectively, by comparing the experimental results and analysis based on the Arnold theory. In the voltage region less than 2 mV, the theory well agreed with the experiment. Moreover, the applied voltage dependence of the supercurrent and quasiparticle current were separately calculated. It was made clear that the supercurrent was larger than the quasiparticle current in the voltage region less than 2Δ/e, where Δ is the superconducting energy gap and e is the absolute value of an electron's charge. The supercurrent began to gradually saturate when the voltage was higher than Δ/e and became constant at the applied voltage greater than 2Δ/e. In our experiment, the excess current larger than expected from the Arnold theory was observed in the voltage region higher than 2Δ/e.

Publication: IEICE TRANSACTIONS on Electronics Vol.E76-C No.8 pp.1319-1324

Publication Date: 1993/08/25

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Type of Manuscript: Special Section PAPER (Special Issue on High-Temperature Superconducting Electronics)

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Shigeru YOSHIMORI, Wataru NAKAHAMA, Mitsuo KAWAMURA, "Experiment and Arnold Theory Analysis of Excess Current due to Andreev Reflection" in IEICE TRANSACTIONS on Electronics, vol. E76-C, no. 8, pp. 1319-1324, August 1993, doi: .
Abstract: Experimental results of an N-S junction and analysis of the results using the Arnold theory were reported. Au and Pb were employed as a normal metal and a superconducting material, respectively. The excess current effect due to the Andreev reflection was observed in the current-voltage characteristics of an N-S junction whose normal resistance was 1.603 Ω. The excess current at 4.62 K was about 0.7 mA when the applied voltage was 2 mV. The barrier height and width were estimated to be 1.0169 eV and 0.7 , respectively, by comparing the experimental results and analysis based on the Arnold theory. In the voltage region less than 2 mV, the theory well agreed with the experiment. Moreover, the applied voltage dependence of the supercurrent and quasiparticle current were separately calculated. It was made clear that the supercurrent was larger than the quasiparticle current in the voltage region less than 2Δ/e, where Δ is the superconducting energy gap and e is the absolute value of an electron's charge. The supercurrent began to gradually saturate when the voltage was higher than Δ/e and became constant at the applied voltage greater than 2Δ/e. In our experiment, the excess current larger than expected from the Arnold theory was observed in the voltage region higher than 2Δ/e.
URL: https://globals.ieice.org/en_transactions/electronics/10.1587/e76-c_8_1319/_p

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@ARTICLE{e76-c_8_1319,
author={Shigeru YOSHIMORI, Wataru NAKAHAMA, Mitsuo KAWAMURA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Experiment and Arnold Theory Analysis of Excess Current due to Andreev Reflection},
year={1993},
volume={E76-C},
number={8},
pages={1319-1324},
abstract={Experimental results of an N-S junction and analysis of the results using the Arnold theory were reported. Au and Pb were employed as a normal metal and a superconducting material, respectively. The excess current effect due to the Andreev reflection was observed in the current-voltage characteristics of an N-S junction whose normal resistance was 1.603 Ω. The excess current at 4.62 K was about 0.7 mA when the applied voltage was 2 mV. The barrier height and width were estimated to be 1.0169 eV and 0.7 , respectively, by comparing the experimental results and analysis based on the Arnold theory. In the voltage region less than 2 mV, the theory well agreed with the experiment. Moreover, the applied voltage dependence of the supercurrent and quasiparticle current were separately calculated. It was made clear that the supercurrent was larger than the quasiparticle current in the voltage region less than 2Δ/e, where Δ is the superconducting energy gap and e is the absolute value of an electron's charge. The supercurrent began to gradually saturate when the voltage was higher than Δ/e and became constant at the applied voltage greater than 2Δ/e. In our experiment, the excess current larger than expected from the Arnold theory was observed in the voltage region higher than 2Δ/e.},
keywords={},
doi={},
ISSN={},
month={August},}

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TY - JOUR
TI - Experiment and Arnold Theory Analysis of Excess Current due to Andreev Reflection
T2 - IEICE TRANSACTIONS on Electronics
SP - 1319
EP - 1324
AU - Shigeru YOSHIMORI
AU - Wataru NAKAHAMA
AU - Mitsuo KAWAMURA
PY - 1993
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E76-C
IS - 8
JA - IEICE TRANSACTIONS on Electronics
Y1 - August 1993
AB - Experimental results of an N-S junction and analysis of the results using the Arnold theory were reported. Au and Pb were employed as a normal metal and a superconducting material, respectively. The excess current effect due to the Andreev reflection was observed in the current-voltage characteristics of an N-S junction whose normal resistance was 1.603 Ω. The excess current at 4.62 K was about 0.7 mA when the applied voltage was 2 mV. The barrier height and width were estimated to be 1.0169 eV and 0.7 , respectively, by comparing the experimental results and analysis based on the Arnold theory. In the voltage region less than 2 mV, the theory well agreed with the experiment. Moreover, the applied voltage dependence of the supercurrent and quasiparticle current were separately calculated. It was made clear that the supercurrent was larger than the quasiparticle current in the voltage region less than 2Δ/e, where Δ is the superconducting energy gap and e is the absolute value of an electron's charge. The supercurrent began to gradually saturate when the voltage was higher than Δ/e and became constant at the applied voltage greater than 2Δ/e. In our experiment, the excess current larger than expected from the Arnold theory was observed in the voltage region higher than 2Δ/e.
ER -