Sharp gap edge and determination of the fermi velocity in Y1Ba2Cu3O7?? by point contact spectroscopy

1992 ◽  
Vol 5 (2) ◽  
pp. 191-194 ◽  
Author(s):  
Nir Mass ◽  
D. Ilzycer ◽  
G. Deutscher ◽  
G. Desgardin ◽  
I. Monot ◽  
...  
Keyword(s):  
Point Contact ◽  
Fermi Velocity ◽  
Point Contact Spectroscopy

POINT CONTACT SPECTROSCOPY IN ORIENTED YBa2Cu3O7−δ

1993 ◽  
Vol 07 (01n03) ◽  
pp. 127-130
Author(s):  
NIR HASS ◽  
D. ILZYCER ◽  
G. DEUTSCHER ◽  
G. DESGARDIN ◽  
I. MONOT ◽  
...  
Keyword(s):  
High Temperature Superconductors ◽  
Point Contact ◽  
Theoretical Explanation ◽  
Precise Determination ◽  
Fermi Velocity ◽  
Zero Bias ◽  
Point Contact Spectroscopy ◽  
Out Of Plane ◽  
Plane Direction

We report point contact spectroscopy measurements on YBa 2 Cu 3 O 7−δ thin films and textured bulk ceramics. The I(V) curves measured along the Copper-Oxygen (ab) plane direction are characteristic of the Andreev reflection phenomenon, with a sharp break at the gap edge. This allows a rather precise determination of the (in plane) gap, Δ = 20 mev . Subgap structure suggests the existence of a smaller gap for some orientations in the (ab) plane, of the order of 12 mev. The data also enabled us to set a lower bound to the inplane Fermi velocity in YBa 2 Cu 3 O 7−δ: v F ≥ 7 × 107 cm/sec . The value of v F has a crucial importance in the determination of the theoretical explanation for superconductivity in the High Temperature Superconductors. For out of plane measurements, only a weak zero bias anomaly is observed at energies up to 5 mev.

scholarly journals Independent determination of the two gaps by directional point-contact spectroscopy in MgB2single crystals

2002 ◽  
Vol 16 (2) ◽  
pp. 171-175 ◽  
Author(s):  
R S Gonnelli ◽  
D Daghero ◽  
G A Ummarino ◽  
V A Stepanov ◽  
J Jun ◽  
...  
Keyword(s):  
Point Contact ◽  
Point Contact Spectroscopy ◽  
Independent Determination

Direct determination of the Andreev reflection probability by means of point contact spectroscopy

2000 ◽  
Vol 76 (9) ◽  
pp. 1152-1154 ◽  
Author(s):  
M. Jakob ◽  
H. Stahl ◽  
J. Knoch ◽  
J. Appenzeller ◽  
B. Lengeler ◽  
...  
Keyword(s):  
Andreev Reflection ◽  
Point Contact ◽  
Direct Determination ◽  
Point Contact Spectroscopy ◽  
Reflection Probability

Gap anisotropy and Fermi velocity in oriented YBa2Cu3O7−δ from point contact spectroscopy

1993 ◽  
Vol 209 (1-3) ◽  
pp. 85-88 ◽  
Author(s):  
Nir Hass ◽  
D. Ilzycer ◽  
G. Deutscher ◽  
G. Desgardin ◽  
I. Monot ◽  
...  
Keyword(s):  
Point Contact ◽  
Fermi Velocity ◽  
Point Contact Spectroscopy ◽  
Gap Anisotropy

Determination of the form factor of the electron-ion potential by point-contact spectroscopy

Physica B+C ◽  
1984 ◽  
Vol 126 (1-3) ◽  
pp. 473-474
Author(s):  
D.G. De Groot ◽  
M.J.G. Lee ◽  
J. Caro ◽  
R. Griessen
Keyword(s):  
Form Factor ◽  
Point Contact ◽  
Point Contact Spectroscopy

Point contact spectroscopy in oriented La2?x Sr x CuO4 superconductors; energy gap and Fermi velocity

1994 ◽  
Vol 7 (4) ◽  
pp. 763-766 ◽  
Author(s):  
Nir Hass ◽  
Guy Deutscher ◽  
A. Revcolevschi ◽  
G. Dhalenne
Keyword(s):  
Energy Gap ◽  
Point Contact ◽  
Fermi Velocity ◽  
Point Contact Spectroscopy

Point-contact spectroscopy of quasi-1D conductors with CDW

1999 ◽  
Vol 09 (PR10) ◽  
pp. Pr10-179-Pr10-181
Author(s):  
A. A. Sinchenko ◽  
Yu. I. Latyshev ◽  
S. G. Zybtsev ◽  
I. G. Gorllova
Keyword(s):  
Point Contact ◽  
Point Contact Spectroscopy
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