The equivalence of the superconducting transition temperature of pure indium as determined by electrical resistance, magnetic susceptibility, and heat-capacity measurements

1971 ◽  
Vol 5 (3) ◽  
pp. 325-333 ◽  
Author(s):  
Robert J. Soulen ◽  
Jack H. Colwell
Keyword(s):  
Heat Capacity ◽  
Magnetic Susceptibility ◽  
Transition Temperature ◽  
Electrical Resistance ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition ◽  
Pure Indium ◽  
Heat Capacity Measurements

SUPERCONDUCTIVITY OF THE Pr-SUBSTITUTED (Nd1−xPrx)Ba2Cu3O7−δ SYSTEM

1988 ◽  
Vol 02 (06) ◽  
pp. 1411-1414 ◽  
Author(s):  
H. C. KU ◽  
C. C. CHEN ◽  
S. W. HSU
Keyword(s):  
Magnetic Susceptibility ◽  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
Orthorhombic Phase ◽  
Tetragonal Structure ◽  
Superconducting Transition ◽  
Oxidizing Agent ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data

Electrical, magnetic and crystallographic measurements have been carried out for the pseudoquaternary ( Nd 1−x Pr x) Ba 2 Cu 3 O 7−δ system. Orthorhombic phase persists from x = 0.0 up to x = 0.7 and transforms into the tetragonal structure only for x ≥ 0.8. Superconducting transition temperature T c decreases linearly from 92 K for x = 0.0 to below 10 K for x = 0.3 and extrapolated to 0 K around x = 0.35. Magnetic susceptibility data indicates that the valence of the Pr ion is close to 4+. Pr 4+ is a very powerful oxidizing agent and may distort or move oxygen away from the Cu-O chain and/or the CuO 2 planes and seriously suppress superconductivity.

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