Hydrogen-impurity-induced conductance peaks in constriction type Josephson junctions

2021 ◽  
Author(s):  
Kazuki Miyakawa ◽  
Hiroki Takata ◽  
Taishi Yamaguchi ◽  
Yuji Inagaki ◽  
Kazumasa Makise ◽  
...  
Keyword(s):  
Temperature Variation ◽  
Josephson Junctions ◽  
Andreev Reflection ◽  
Josephson Current ◽  
Differential Conductance ◽  
Superconducting Gap ◽  
Impurity Effects ◽  
Hydrogen Impurity ◽  
Multiple Andreev Reflection

Abstract We studied hydrogen (H) and deuterium (D) impurity effects of superconducting Josephson current flowing through the superconductor-constriction-superconductor Josephson junctions (ScS-JJ). When H or D impurities are adsorbed on the surface of the ScS-JJ prepared by niobium (Nb) or lead (Pb), many spike-like peaks with almost the same spacing appear inside the superconducting gap in addition to anomalies owing to the multiple Andreev reflection in the differential conductance spectra. The spacing between the adjacent peaks is independent of the temperature variation. These indicate that H or D impurities adsorbed on the JJ are sources of noise for the Josephson current.

Multiple Andreev reflection in MgB2/MgO/MgB2 Josephson junctions

2012 ◽  
Vol 100 (12) ◽  
pp. 122601 ◽  
Author(s):  
Ke Chen ◽  
Daniel Cunnane ◽  
Yi Shen ◽  
X. X. Xi ◽  
Alan W. Kleinsasser ◽  
...  
Keyword(s):  
Josephson Junctions ◽  
Andreev Reflection ◽  
Multiple Andreev Reflection

scholarly journals Crossed Andreev reflection in InSb flake Josephson junctions

2019 ◽  
Vol 1 (3) ◽  
Author(s):  
Folkert K. de Vries ◽  
Martijn L. Sol ◽  
Sasa Gazibegovic ◽  
Roy L. M. op het Veld ◽  
Stijn C. Balk ◽  
...  
Keyword(s):  
Josephson Junctions ◽  
Andreev Reflection ◽  
Crossed Andreev Reflection

scholarly journals Investigation of superconducting gap structure in TbFeAsO0.9F0.1using point contact Andreev reflection

2009 ◽  
Vol 11 (2) ◽  
pp. 025015 ◽  
Author(s):  
K A Yates ◽  
K Morrison ◽  
J A Rodgers ◽  
G B S Penny ◽  
J-W G Bos ◽  
...  
Keyword(s):  
Andreev Reflection ◽  
Point Contact ◽  
Superconducting Gap ◽  
Gap Structure

Impurity effects in rf O2plasma oxidation for Pb‐alloy Josephson junctions

1986 ◽  
Vol 59 (5) ◽  
pp. 1696-1701 ◽  
Author(s):  
Junichi Nakano ◽  
Masato Wada
Keyword(s):  
Josephson Junctions ◽  
Impurity Effects

Observation of enhanced thermal noise due to multiple Andreev reflection in ballistic InGaAs-based superconducting weak links

2005 ◽  
Vol 86 (13) ◽  
pp. 132505 ◽  
Author(s):  
Tatsushi Akazaki ◽  
Hayato Nakano ◽  
Junsaku Nitta ◽  
Hideaki Takayanagi
Keyword(s):  
Thermal Noise ◽  
Andreev Reflection ◽  
Weak Links ◽  
Multiple Andreev Reflection

SPIN DEPENDENCE OF PAIR TUNNELING PROPERTIES OF Bi2Sr2CaCu2O8+x INTRINSIC JOSEPHSON JUNCTIONS

2005 ◽  
Vol 19 (01n03) ◽  
pp. 199-203 ◽  
Author(s):  
DO BANG ◽  
HU-JONG LEE ◽  
MYUNG-HO BAE ◽  
WANG-HYUN PARK
Keyword(s):  
External Field ◽  
Single Crystal ◽  
Josephson Junctions ◽  
Phase Fluctuation ◽  
Superconducting Gap ◽  
Spin Dependence ◽  
Intrinsic Josephson Junctions ◽  
Pair Tunneling ◽  
Spin Polarized ◽  
Pancake Vortices

Detailed tunneling characteristics of a stack of intrinsic Josephson junctions in a Bi 2 Sr 2 CaCu 2 O 8+x single crystal were obtained both in spin-degenerate and spin-polarized bias configurations. Injection of the spin-polarized quasiparticles effectively weakened the in-plane superconducting strength and the interlayer Jospehson coupling. The superconducting gap and the Josephson critical current of the stack were, in general, further suppressed by an external field applied in parallel with the c-axis direction. Study of the spin-dependent tunneling characteristics may provide valuable information on clarifying the mechanism of high-Tc superconductivity as well as the interlayer phase fluctuation induced by the "pancake vortices" on CuO 2 layers.

The Impurity Effects on the Superconducting Gap in the High- T c Superconductor Bi2Sr2CaCu2−x Fe x O 8 + δ Investigated by STM/STS

2015 ◽  
Vol 29 (3) ◽  
pp. 659-662 ◽  
Author(s):  
S. Baar ◽  
N. Momono ◽  
K. Kawamura ◽  
Y. Kobayashi ◽  
S. Iwasaki ◽  
...  
Keyword(s):  
Superconducting Gap ◽  
Impurity Effects
Sign in / Sign up

Export Citation Format

Share Document