Superconducting transition temperature enhancement in YBa2Cu3O7by chemical substitution and the implications thereof for the upper critical magnetic field

1992 ◽  
Vol 61 (15) ◽  
pp. 1852-1854 ◽  
Author(s):  
J. J. Neumeier
Keyword(s):  
Magnetic Field ◽  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
Critical Magnetic Field ◽  
Superconducting Transition ◽  
Chemical Substitution ◽  
Upper Critical Magnetic Field ◽  
Temperature Enhancement

CRITICAL FIELD AND MAGNETORESISTANCE OF SINGLE CRYSTAL TmNi2B2C

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3715-3717 ◽  
Author(s):  
D. G. NAUGLE ◽  
K. D. D. RATHNAYAKA ◽  
K. CLARK ◽  
P. C. CANFIELD
Keyword(s):  
Magnetic Field ◽  
Transition Temperature ◽  
Single Crystal ◽  
Critical Field ◽  
Superconducting Transition Temperature ◽  
Magnetic Transition ◽  
Upper Critical Field ◽  
Superconducting Transition ◽  
Large Anisotropy ◽  
The Magnetic Field

In-plane resistance as a function of magnitude and direction of the magnetic field and the temperature has been measured for TmNi2B2C from above the superconducting transition temperature at 10.7 K to below the magnetic transition TN=1.5 K. The superconducting upper critical field HC2(T) exhibits a large anisotropy and structure in the vicinity of TN. The magnetoresistance above TC is large and changes sign as the direction of the magnetic field is rotated from in-plane to parallel with the c-axis.

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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