scholarly journals Effect of magnetic impurities on suppression of the transition temperature in disordered superconductors

2000 ◽  
Vol 62 (9) ◽  
pp. 5913-5930 ◽  
Author(s):  
Robert A. Smith ◽  
Vinay Ambegaokar
Keyword(s):  
Transition Temperature ◽  
Magnetic Impurities ◽  
Disordered Superconductors

SUPERCONDUCTING PROPERTY IN Mn DOPED La1.85Sr0.15CuO4 SYSTEM

2005 ◽  
Vol 19 (01n03) ◽  
pp. 303-305 ◽  
Author(s):  
CHANGJIN ZHANG ◽  
J. S. KIM ◽  
B. H. KIM ◽  
Y. W. PARK
Keyword(s):  
Transition Temperature ◽  
Superconducting Property ◽  
Magnetic Impurities ◽  
Pair Breaking ◽  
Superconducting Transition ◽  
Superconducting Properties ◽  
Breaking Effect ◽  
Mn Doping ◽  
Magnetic Pair ◽  
Mn Doped

In this paper the superconducting properties in La 1.85S Sr 0.15 Cu 1-x Mn x O 4 and La 1.85-2x Sr 0.15+2x Cu 1-x Mn x O 4 samples are discussed. The superconducting transition temperature keeps constantly at 37 K for all superconducting samples. The suppression of superconductivity in these systems does not fit the Arbrikosov and Gork'ov theory which predicts that Tc should decrease in the presence of magnetic impurities in the lattice. The magnetic pair-breaking effect is not the reason for the suppression of superconductivity in Mn doping systems. The localization of carriers in the CuO 2 plane induced by Mn doping should be responsible for the suppression of superconductivity.

Resistance Anomaly Near Superconducting Transition Temperature of Zr–Cu Metallic Glasses

1997 ◽  
Vol 11 (10) ◽  
pp. 1257-1265 ◽  
Author(s):  
A. K. Mondal ◽  
S. K. Roy
Keyword(s):  
Transition Temperature ◽  
Metallic Glasses ◽  
Qualitative Agreement ◽  
Superconducting Transition Temperature ◽  
Magnetic Impurities ◽  
Superconducting Transition ◽  
Good Qualitative Agreement ◽  
Experimental Findings ◽  
Theoretical Analyses ◽  
Resistance Anomaly

The theoretical analyses of the recent discovery of a new resistance anomaly in Zr–Cu superconducting metallic glasses with dilute magnetic impurities have been made. The resistance peaks are found to occur within 20–60 mK range above the resistive midpoint of the superconducting transition. The influence of Zr concentration on the peak has also been investigated. The results are in good qualitative agreement with the reported experimental findings.

In situ Tensile Experiments at Low Temperatures on Niobium Single Crystals by H.V.E.M.

1975 ◽  
Vol 33 ◽  
pp. 58-59
Author(s):  
F. H. Louchet ◽  
L. P. Kubin
Keyword(s):  
Electron Microscope ◽  
Transition Temperature ◽  
Low Temperature ◽  
Slip System ◽  
Low Temperatures ◽  
Tensile Axis ◽  
Image Intensifier ◽  
Screw Dislocations ◽  
Source Operation

Experiments have been carried out on the 3 MeV electron microscope in Toulouse. The low temperature straining holder has been previously described Images given by an image intensifier are recorded on magnetic tape.The microtensile niobium samples are cut in a plane with the two operative slip directions [111] and lying in the foil plane. The tensile axis is near [011].Our results concern:- The transition temperature of niobium near 220 K: at this temperature and below an increasing difference appears between the mobilities of the screw and edge portions of dislocations loops. Source operation and interactions between screw dislocations of different slip system have been recorded.

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