scholarly journals Superconducting order parameters in overdoped BaFe1.86Ni0.14As2 revealed by multiple Andreev reflection spectroscopy of planar break junctions

2021 ◽  
Vol 104 (17) ◽  
Author(s):  
T. E. Kuzmicheva ◽  
S. A. Kuzmichev ◽  
K. S. Pervakov ◽  
V. A. Vlasenko
Keyword(s):  
Andreev Reflection ◽  
Order Parameters ◽  
Reflection Spectroscopy ◽  
Break Junctions ◽  
Multiple Andreev Reflection

scholarly journals Evolution of superconducting gaps in Th-substituted Sm1−xThxOFeAs studied by multiple Andreev reflection spectroscopy

2017 ◽  
Vol 95 (9) ◽  
Author(s):  
T. E. Kuzmicheva ◽  
S. A. Kuzmichev ◽  
K. S. Pervakov ◽  
V. M. Pudalov ◽  
N. D. Zhigadlo
Keyword(s):  
Andreev Reflection ◽  
Reflection Spectroscopy ◽  
Multiple Andreev Reflection

Multiple Andreev reflection in YBCO break-junctions

1996 ◽  
Vol 218 (1-4) ◽  
pp. 205-208 ◽  
Author(s):  
U. Zimmermann ◽  
S. Abens ◽  
D. Dikin ◽  
K. Keck ◽  
T. Wolf
Keyword(s):  
Andreev Reflection ◽  
Break Junctions ◽  
Multiple Andreev Reflection

Multiple Andreev Reflection Spectroscopy of Optimally Doped Ba(Fe, Ni)2As2 Superconducting Pnictides

JETP Letters ◽  
2020 ◽  
Vol 112 (12) ◽  
pp. 786-792
Author(s):  
T. E. Kuzmicheva ◽  
S. A. Kuzmichev ◽  
K. S. Pervakov ◽  
V. A. Vlasenko
Keyword(s):  
Andreev Reflection ◽  
Reflection Spectroscopy ◽  
Multiple Andreev Reflection

Multiple Andreev-reflection in YBCO break-junctions

1996 ◽  
Vol 101 (4) ◽  
pp. 547-553 ◽  
Author(s):  
U. Zimmermann ◽  
S. Abens ◽  
D. Dikin ◽  
K. Keck ◽  
T. Wolf
Keyword(s):  
Andreev Reflection ◽  
Break Junctions ◽  
Multiple 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.

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