A Tunneling Study of Superconducting YBa2 Cu3Oy By Contact Junctions At 77 K

1987 ◽  
Vol 99 ◽  
Author(s):  
H. Enomoto ◽  
K. Gotoh ◽  
K. Iida ◽  
Y. Takano ◽  
N. Mori ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Electronic Structures ◽  
Energy Gap ◽  
High Tc ◽  
Bcs Model ◽  
High Tc Superconductor ◽  
Derivative Analysis ◽  
Superconducting Energy Gap

ABSTRACTGiaever tunneling measurements have been applied to investigate the electronic structures of the high Tc superconductor YB2Cu3Oy near Tc. The superconducting energy gap of 17 meV was observed in V-dl/dv curve at 77 K. In the light of BCS model, 2Δ0Δ/kBTc was estimated as 3.3. Several dip structures were observed in the bias region up to 0.5 eV in V-dl/dV curve, using the 3rd derivative analysis. Through the temperature dependence, these structures were found to be associated with the superconductivity.

High Tc Oxide Superconductors

MRS Bulletin ◽  
1990 ◽  
Vol 15 (6) ◽  
pp. 31-33
Author(s):  
M. Brian Maple
Keyword(s):  
Physical Properties ◽  
Energy Gap ◽  
Vortex State ◽  
Oxide Superconductors ◽  
High Tc ◽  
Superconducting Energy Gap ◽  
Consistent Picture ◽  
Novel Processing ◽  
Processing Techniques

This issue of the MRS BULLETIN is devoted to high Tc superconductivity. It is the sequel to a previous series of articles on the same subject which appeared in the MRS BULLETIN in January 1989. While the articles in the January 1989 issue emphasized the families of high Tc superconducting oxides known at that rime, as well as novel processing techniques and thin films, the papers in this issue focus on the physical properties of high Tc oxide superconductors.The quality of polycrystalline and single-crystal bulk and thin-film materials has improved to the point where researchers can now make reliable measurements of many physical properties representative of the intrinsic behavior of these materials. As a result, a broad spectrum of important issues such as the nature of the electronic structure, the type of superconducting electron pairing, the magnitude and temperature dependence of the superconducting energy gap, the behavior of fluxoids in the vortex state, etc., can be addressed meaningfully. Presently emerging is a consistent picture of the physical properties of the high Tc oxides, which will form the foundation to eventually developing an appropriate theory for the normal and superconducting states of these remarkable materials.

Tunneling Measurements of Density of States in Superconducting YBa2Cu3Oy

1987 ◽  
Vol 99 ◽  
Author(s):  
K.I Ida ◽  
K. Gotoh ◽  
H. Enomoto ◽  
Y. Takano ◽  
N. Mori ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Temperature Dependence ◽  
Density Of States ◽  
High Tc ◽  
Temperature Range ◽  
High Tc Superconductor

ABSTRACTTunneling measurements were applied to investigate the density of states of the high Tc superconductor in the temperature range from 4.2 K to the transition temperature. Several structures were found in conductance curves in higher bias region than ever reported, and they vanished around Tc. Temperature dependence of the bias voltages at which these structures appeared showed the BCS-like behavior.

Temperature dependence of Doppler broadening of the annihilation line in a high Tc superconductor

1988 ◽  
Vol 128 (1-2) ◽  
pp. 97-99 ◽  
Author(s):  
Stef. Charalambous ◽  
M. Chardalas ◽  
Sp. Dedoussis ◽  
C. Elefteriades ◽  
A.K. Liolios ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Doppler Broadening ◽  
High Tc ◽  
Annihilation Line ◽  
High Tc Superconductor

The energy gap of the high Tc superconductor La1.85Sr0.15CuO4

1987 ◽  
Vol 62 (6) ◽  
pp. 383-385 ◽  
Author(s):  
D.A. Bonn ◽  
J.E. Greedan ◽  
C.V. Stager ◽  
T. Timusk
Keyword(s):  
Energy Gap ◽  
High Tc ◽  
High Tc Superconductor
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