TRANSPORT PROPERTIES OF NORMAL METAL/ ANISOTROPIC SUPERCONDUCTOR JUNCTIONS IN THE EUTECTIC SYSTEM Sr2RuO4-Ru

2005 ◽  
Author(s):  
M. KAWAMURA ◽  
H. YAGUCHI ◽  
N. KIKUGAWA ◽  
Y. MAENO ◽  
H. TAKAYANAGI
Keyword(s):  
Transport Properties ◽  
Normal Metal ◽  
Eutectic System ◽  
Anisotropic Superconductor

ANTI-RESONANCES IN A NORMAL METAL/SUPERCONDUCTOR JUNCTION WITH A SIDE-COUPLED QUANTUM DOT

2010 ◽  
Vol 24 (28) ◽  
pp. 5505-5513
Author(s):  
ZHENG-YI WU ◽  
JIN-FU FENG
Keyword(s):  
Quantum Dot ◽  
Transport Properties ◽  
Single Particle ◽  
Gate Voltage ◽  
Coulomb Blockade ◽  
Andreev Reflection ◽  
Normal Metal ◽  
Destructive Interference ◽  
Channel Network ◽  
Calculated Dependence

Using the equivalent single-particle multi-channel network and the Landauer formula, we theoretically study anti-resonances in conductance of a normal metal–superconductor junction with a side-coupled quantum dot. The transport properties depend on the interplay between the Coulomb blockade effect and the Andreev reflection. It is found that the calculated dependence of the conductance on the gate voltage of dot exhibits two anti-resonant conductance dips. This behavior is caused by the destructive interference of the wave directly transmitted through the normal metal–superconductor junction and the wave reflected from the dot. Moreover, we find that the shape of two anti-resonance profile is symmetric, due to the Andreev reflection, depending on the strength of coupling between the quantum dot and normal metal.

ON THE Zn-DOPING INDUCED EFFECTS IN La2−xSrx(Cu1−yZny)O4

1994 ◽  
Vol 08 (03) ◽  
pp. 185-194 ◽  
Author(s):  
J. OLEJNICZAK ◽  
A.J. ZALESKI ◽  
M. CISZEK
Keyword(s):  
Transport Properties ◽  
Normal Metal ◽  
Twin Boundaries ◽  
Zn Doping

We have studied the effects of Zn -doping on the transport properties of La 2−x Sr x( Cu 1−y Zn y) O 4. We have observed anomalously strong doping-induced increase of resistivity below 100 K together with “normal-metal” behavior of resistivity at higher temperatures (T>250 K ). These data seem to support a model in which Zn impurity influences strongly the properties of the twin boundaries.

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