Depression of the superconducting transition temperature by magnetic impurities: Effect of Kondo resonance in thefdensity of states

1987 ◽  
Vol 36 (13) ◽  
pp. 6746-6772 ◽  
Author(s):  
N. E. Bickers ◽  
G. E. Zwicknagl
Keyword(s):  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
Magnetic Impurities ◽  
Superconducting Transition ◽  
Kondo Resonance

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.

scholarly journals Enhancing Superconductivity of the Nonmagnetic Quasiskutterudites by Atomic Disorder

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5830
Author(s):  
Andrzej Ślebarski ◽  
Maciej M. Maśka
Keyword(s):  
High Temperature ◽  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
High Temperature Superconductors ◽  
Superconducting Phase ◽  
Length Scale ◽  
Superconducting Transition ◽  
Atomic Disorder ◽  
Strong Inhomogeneity ◽  
Related Compounds

We investigated the effect of enhancement of superconducting transition temperature Tc by nonmagnetic atom disorder in the series of filled skutterudite-related compounds (La3M4Sn13, Ca3Rh4Sn13, Y5Rh6Sn18, Lu5Rh6Sn18; M= Co, Ru, Rh), where the atomic disorder is generated by various defects or doping. We have shown that the disorder on the coherence length scale ξ in these nonmagnetic quasiskutterudite superconductors additionally generates a non-homogeneous, high-temperature superconducting phase with Tc⋆>Tc (dilute disorder scenario), while the strong fluctuations of stoichiometry due to increasing doping can rapidly increase the superconducting transition temperature of the sample even to the value of Tc⋆∼2Tc (dense disorder leading to strong inhomogeneity). This phenomenon seems to be characteristic of high-temperature superconductors and superconducting heavy fermions, and recently have received renewed attention. We experimentally documented the stronger lattice stiffening of the inhomogeneous superconducting phase Tc⋆ in respect to the bulk Tc one and proposed a model that explains the Tc⋆>Tc behavior in the series of nonmagnetic skutterudite-related compounds.

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.

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