scholarly journals Doping dependence of the superconducting gap by Andreev reflection in Au/La2−xSrxCuO4 point-contact junctions

2002 ◽  
Vol 63 (12) ◽  
pp. 2369-2373 ◽  
Author(s):  
R.S. Gonnelli ◽  
A. Calzolari ◽  
D. Daghero ◽  
L. Natale ◽  
G.A. Ummarino ◽  
...  
Keyword(s):  
Andreev Reflection ◽  
Point Contact ◽  
Superconducting Gap ◽  
Doping Dependence

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

scholarly journals Point-contact Andreev reflection tunneling spectroscopic (PCARTS) study of the superconducting gap structure in LuNi2B2C

2009 ◽  
Vol 150 (5) ◽  
pp. 052143 ◽  
Author(s):  
Xin Lu ◽  
W K Park ◽  
Ki-Young Choi ◽  
Sung-Ik Lee ◽  
Sunmog Yeo ◽  
...  
Keyword(s):  
Andreev Reflection ◽  
Point Contact ◽  
Superconducting Gap ◽  
Gap Structure

scholarly journals POSSIBLE d + id SCENARIO IN La2-xSrxCuO4 BY POINT-CONTACT MEASUREMENTS

2003 ◽  
Vol 17 (04n06) ◽  
pp. 649-654 ◽  
Author(s):  
D. DAGHERO ◽  
R. S. GONNELLI ◽  
G. A. UMMARINO ◽  
V. A. STEPANOV
Keyword(s):  
Copper Oxide ◽  
Andreev Reflection ◽  
Point Contact ◽  
Theoretical Models ◽  
Doping Dependence ◽  
Wave Symmetry ◽  
Contact Measurements

We analyze the results of point-contact measurements in La 2-x Sr x CuO 4 (LSCO) previously reported as a clear evidence of the separation between gap and pseudo-gap in this copper oxide. Here we show that, in addition to this, the conductance curves of our point-contact junctions – showing clear Andreev reflection features – can be interpreted as supporting a nodeless dx2 - y2 + i dxy-wave symmetry of the gap in LSCO. The results of our analysis, in particular the doping dependence of the subdominant dxy gap component, are discussed and compared to the predictions of different theoretical models.

Point-contact Andreev reflection spectroscopic study of the superconducting gap structure in LuNi2B2C

2008 ◽  
Vol 403 (5-9) ◽  
pp. 1098-1100 ◽  
Author(s):  
Xin Lu ◽  
W.K. Park ◽  
Jung-Dae Kim ◽  
Sunmog Yeo ◽  
Sung-Ik Lee ◽  
...  
Keyword(s):  
Spectroscopic Study ◽  
Andreev Reflection ◽  
Point Contact ◽  
Superconducting Gap ◽  
Gap Structure

Point Contact Andreev Reflection Measurement of the Spin Polarization of Ferromagnetic Alloy NiFeSb

2002 ◽  
Vol 19 (8) ◽  
pp. 1181-1183 ◽  
Author(s):  
Li Zhuang-Zhi ◽  
Tao Hong-Jie ◽  
Wen Hai-Hu ◽  
Zhang Ming ◽  
Liu Zhu-Hong ◽  
...  
Keyword(s):  
Spin Polarization ◽  
Andreev Reflection ◽  
Point Contact ◽  
Ferromagnetic Alloy ◽  
Reflection Measurement

scholarly journals POINT-CONTACT SPECTROSCOPY OF MAGNESIUM DIBORIDE WITH DIFFERENT COUNTER-ELECTRODES

2003 ◽  
Vol 17 (27n28) ◽  
pp. 1405-1416
Author(s):  
A. I. D'YACHENKO ◽  
V. YU. TARENKOV ◽  
M. A. BELOGOLOVSKII ◽  
V. N. VARYUKHIN ◽  
A. V. ABAL'OSHEV ◽  
...  
Keyword(s):  
Andreev Reflection ◽  
Magnesium Diboride ◽  
Three Dimensional ◽  
Point Contact ◽  
Band Model ◽  
Counter Electrodes ◽  
Break Junctions ◽  
Point Contact Spectroscopy ◽  
Dc Current ◽  
Two Band Model

We report on tunneling and Andreev-reflection conductance spectra of 39 K superconducting magnesium diboride, obtained with Pb and Au counter-electrodes. Two distinct steps at close to 2.7 and 7.1 meV appear in a low-resistance metallic-type Au–MgB 2 junction characteristic, whereas a tunneling-like spectrum measured for the same junction, annealed by the application of DC current, exhibits only a rounded contribution of the larger gap. Junctions with a superconducting lead counter-electrode pressed into a bulk MgB 2 sample reveal two conductance peaks that are interpreted as the result of the formation of a highly-transmitting break junctions inside the magnesium diboride ceramic. Our results strongly support the two-band model with two different gap values on quasi-two-dimensional σ (7.1 meV) and three-dimensional π (2.7 meV) Fermi surface sheets of MgB 2.

scholarly journals Transport spin polarization inSrRuO3measured through point-contact Andreev reflection

2003 ◽  
Vol 67 (2) ◽  
Author(s):  
P. Raychaudhuri ◽  
A. P. Mackenzie ◽  
J. W. Reiner ◽  
M. R. Beasley
Keyword(s):  
Spin Polarization ◽  
Andreev Reflection ◽  
Point Contact

PHOTON-ASSISTED TRANSPORT CHARACTERISTICS THROUGH QUANTUM DOT COUPLED TO SUPERCONDUCTING RESERVOIRS

NANO ◽  
2006 ◽  
Vol 01 (03) ◽  
pp. 259-264 ◽  
Author(s):  
A. S. ATALLAH ◽  
A. H. PHILLIPS ◽  
A. F. AMIN ◽  
M. A. SEMARY
Keyword(s):  
Magnetic Field ◽  
Numerical Calculation ◽  
Quantum Dot ◽  
Resonant Tunneling ◽  
Andreev Reflection ◽  
Point Contact ◽  
Quantum Point Contact ◽  
Time Varying ◽  
Quantum Point ◽  
Tunneling Behavior

The influence of time-varying fields on the transport through a mesoscopic device has been investigated. This mesoscopic device is modeled as a quantum dot coupled to superconducting reservoirs via quantum point contact. The effect of a magnetic field and the Andreev reflection process were taken into account. The conductance was deduced by using Landuaer–Buttiker equation. A numerical calculation has been performed that shows a resonant tunneling behavior. Such investigation is important for fabricating photoelectron mesoscopic devices.

scholarly journals Andreev bound states in superconductor/ferromagnet point contact Andreev reflection spectra

2017 ◽  
Vol 95 (9) ◽  
Author(s):  
K. A. Yates ◽  
L. A. B. Olde Olthof ◽  
M. E. Vickers ◽  
D. Prabhakaran ◽  
M. Egilmez ◽  
...  
Keyword(s):  
Bound States ◽  
Andreev Reflection ◽  
Point Contact ◽  
Reflection Spectra ◽  
Andreev Bound States
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