Andreev reflection in point-contact tunneling spectroscopy on Bi2Sr1.94La0.06CuO6+δ single crystals

2000 ◽  
Vol 338 (3) ◽  
pp. 213-220 ◽  
Author(s):  
Shao-Xiong Li ◽  
Yi Xuan ◽  
Hong-Jie Tao ◽  
Wan-Li Yang ◽  
Hai-Hu Wen ◽  
...  
Keyword(s):  
Single Crystals ◽  
Andreev Reflection ◽  
Point Contact ◽  
Tunneling Spectroscopy

Doping Induced Gap Anisotropy in Iron-Based Superconductors: a Point-Contact Andreev Reflection Study of BaFe 2−x Ni x As 2 Single Crystals

2015 ◽  
Vol 32 (7) ◽  
pp. 077401 ◽  
Author(s):  
Jun Zhu ◽  
Zhao-Sheng Wang ◽  
Zhen-Yu Wang ◽  
Xing-Yuan Hou ◽  
Hui-Qian Luo ◽  
...  
Keyword(s):  
Single Crystals ◽  
Andreev Reflection ◽  
Point Contact ◽  
Iron Based Superconductors ◽  
Gap Anisotropy ◽  
Iron Based

scholarly journals Point-contact Andreev reflection spectroscopy on Bi2Se3 single crystals

2016 ◽  
Vol 30 (13) ◽  
pp. 1642002 ◽  
Author(s):  
C. R. Granstrom ◽  
I. Fridman ◽  
H.-C. Lei ◽  
C. Petrovic ◽  
J. Y. T. Wei
Keyword(s):  
Single Crystals ◽  
Andreev Reflection ◽  
Surface Condition ◽  
Three Dimensional ◽  
Point Contact ◽  
Scanning Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Zero Bias ◽  
Zero Bias Conductance

To study how Andreev reflection (AR) occurs between a superconductor and a three-dimensional topological insulator (TI), we use superconducting Nb tips to perform point-contact AR spectroscopy at 4.2 K on as-grown single crystals of Bi2Se3. Scanning tunneling spectroscopy and scanning tunneling microscopy are also used to characterize the superconducting tip and both the doping level and surface condition of the TI sample. The point-contact measurements show clear spectral signatures of AR, as well as a depression of zero-bias conductance with decreasing junction impedance. The latter observation can be attributed to interfacial Rashba spin-orbit coupling, and the presence of bulk bands at the Fermi level in our samples suggests that bulk states of Bi2Se3 are involved in the observed AR.

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

Andreev reflection and tunneling results on YBa2Cu3O7 and Nd2−xCexCuO4−y single crystals

1990 ◽  
pp. 323-333
Author(s):  
T. W. Jing ◽  
Z. Z. Wang ◽  
N. P. Ong ◽  
J. M. Tarascon ◽  
E. Wang
Keyword(s):  
Single Crystals ◽  
Andreev Reflection

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 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 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
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