Effect of Surface Charge on the Superconducting Transition Temperature and Normal-State Conductivity of Disordered Metal Films

1972 ◽  
Vol 9 (1) ◽  
pp. 337-340 ◽  
Author(s):  
W. Felsch ◽  
R. E. Glover
Keyword(s):  
Transition Temperature ◽  
Surface Charge ◽  
Normal State ◽  
Superconducting Transition Temperature ◽  
Metal Films ◽  
Superconducting Transition ◽  
Effect Of Surface

Electron Irradiation of YBa2Cu3O7 at low Temperatures

1987 ◽  
Vol 99 ◽  
Author(s):  
B. Stritzker ◽  
W. Zander ◽  
F. Dworschak ◽  
U. Poppe ◽  
K. Fischer
Keyword(s):  
Transition Temperature ◽  
Electron Irradiation ◽  
Normal State ◽  
Low Temperatures ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition ◽  
Radiation Induced ◽  
State Resistance ◽  
Normal State Resistance

ABSTRACTBulk samples of YBa2Cu3O7−x have been homogenously irradiated with 3 MeV electrons at temperatures below 20 K. Whereas the superconducting transition temperature, Tc, drops dramatically with increasing dose the width of the transition remains unchanged (Δ Tc ≤ 1.5 K). The normal state resistance at 100 K increases substantially during the electron irradiation. Several irreproducible experiments can be interpreted with a radiation induced, unstable increase of Tc.

THE OCCURRENCE OF SUPERCONDUCTIVITY IN THE Ho (Ba2−xSrx) Cu3O7−δ SYSTEM

1989 ◽  
Vol 03 (03) ◽  
pp. 225-227 ◽  
Author(s):  
M.F. TAI ◽  
J.R. HWANG ◽  
H.C. KU
Keyword(s):  
Electrical Resistivity ◽  
Transition Temperature ◽  
Phase Boundary ◽  
Normal State ◽  
Superconducting Transition Temperature ◽  
Systematic Variation ◽  
Superconducting Transition ◽  
Occurrence Of Superconductivity

Electrical, magnetic and crystallographic measurements have been carried out for the pseudoquaternary Ho ( Ba 2−x Sr x) Cu 3 O 7−δ system in order to check the systematic variation of superconducting transition temperature T c , normal state electrical resistivity and phase boundary. T c decreases monotonically with the increasing Sr substitution and drops sharply to zero for x≥1.6. No resisitivity anomaly was observed.

Evidence for d-Electron Localization in YBa2(Cu1−xZnx)3O7 for 0

1987 ◽  
Vol 99 ◽  
Author(s):  
C. Jee ◽  
D. Nichols ◽  
J. Ciasullo ◽  
J. E. Crow ◽  
T. Mihalisin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Transition Temperature ◽  
Normal State ◽  
Superconducting Transition Temperature ◽  
Critical Value ◽  
Internal Magnetic Field ◽  
Electron Localization ◽  
Superconducting Transition ◽  
Zn Substitution ◽  
Zn Concentration

ABSTRACTZn substitution for Cu in YBa2Cu3O7 rapidly reduces the superconducting transition temperature, Tc. Superconductivity is quenched between x=0.08 (T =30 K) and x=0.10. The normal state paramagnetism grows with Zn substu-tition, presumably due to increased localization on the Cu sublattice. Susceptibility studies of oxygen depleted (nonsuperconducting) Zn-substituted samples support this. Strong non-linear isothermal magnetization suggesting an internal magnetic field is found at T=4.2 K in samples with Zn concentration near to the critical value for suppression of superconductivity. The results are discussed in terms of increased localization of d-electrons on the Cu sites with increasing Zn concentration, which is consistent with recent EPR data.

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