Superconducting state in a presence of a momentum-dependent impurity scattering potential

2010 ◽  
Author(s):  
D. Rudzińska ◽  
Adolfo Avella ◽  
Ferdinando Mancini
Keyword(s):  
Superconducting State ◽  
Impurity Scattering ◽  
Scattering Potential

scholarly journals Normal and superconducting state in the presence of forward electron-phonon and impurity scattering

1999 ◽  
Vol 9 (2) ◽  
pp. 201-206 ◽  
Author(s):  
O.V. Danylenko ◽  
O.V. Dolgov ◽  
M.L. Kulic ◽  
V. Oudovenko
Keyword(s):  
Superconducting State ◽  
Impurity Scattering

CORRELATION BETWEEN THE POTENTIAL CONTRIBUTION AND MAGNETIC TRANSPORT PROPERTIES FOR MAGNETIC MULTILAYERS

1999 ◽  
Vol 13 (11) ◽  
pp. 1437-1446
Author(s):  
LING-YUN ZHANG ◽  
HONG SUN ◽  
BO-ZANG LI ◽  
FU-CHO PU
Keyword(s):  
Transport Properties ◽  
Giant Magnetoresistance ◽  
Impurity Scattering ◽  
Potential Effect ◽  
Magnetic Multilayers ◽  
Exchange Potential ◽  
Potential Contribution ◽  
Magnetic Multilayer ◽  
Scattering Potential ◽  
Magnetic Transport

We discuss the exchange potential and impurity scattering potential effect on the magnetic transport properties of magnetic multilayers. In the case of Hartree–Fork approximation, the model Hamiltonian with respect to the magnetization and potential contribution is presented. The expression of giant magnetoresistance is obtained by considering both interface and bulk magnetization contribution. The results show that the giant magnetoresistance in magnetic multilayer is different for different layer thickness. Meanwhile, we also clarify the interface and bulk contribution of the giant magnetoresistance in magnetic multilayer for different exchange potential and impurity scattering potential.

scholarly journals Self-consistent solution for the magnetic exchange interaction mediated by a superconductor

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Atousa Ghanbari ◽  
Vetle K. Risinggård ◽  
Jacob Linder
Keyword(s):  
Exchange Interaction ◽  
Superconducting State ◽  
Ground State ◽  
Tight Binding ◽  
Impurity Scattering ◽  
Superconducting Gap ◽  
Condensation Energy ◽  
Magnetic Exchange Interaction ◽  
Magnetic Exchange ◽  
Parallel Configuration

AbstractWe theoretically determine the magnetic exchange interaction between two ferromagnets coupled by a superconductor using a tight-binding lattice model. The main purpose of this study is to determine how the self-consistently determined superconducting state influences the exchange interaction and the preferred ground-state of the system, including the role of impurity scattering. We find that the superconducting state eliminates RKKY-like oscillations for a sufficiently large superconducting gap, making the anti-parallel orientation the ground state of the system. Interestingly, the superconducting gap is larger in the parallel configuration than in the anti-parallel configuration, giving a larger superconducting condensation energy, even when the preferred ground state is anti-parallel. We also show that increasing the impurity concentration in the superconductor causes the exchange interaction to decrease, likely due to an increasing localization of the mediating quasiparticles in the superconductor.

scholarly journals Quasiparticle Lifetimes and the Conductivity Scattering Rate

1997 ◽  
Vol 50 (6) ◽  
pp. 1011 ◽  
Author(s):  
F. Marsiglio ◽  
J. P. Carbotte
Keyword(s):  
Fermi Surface ◽  
Single Particle ◽  
Superconducting State ◽  
Qualitative Agreement ◽  
Impurity Scattering ◽  
Quantitative Agreement ◽  
Metallic System ◽  
S Wave ◽  
Scattering Rate ◽  
Quasiparticle Lifetime

We compute the single-particle inverse lifetime, along with the conductivity-derived scattering rate, for a metallic system in an s-wave superconducting state. When both electron–phonon and electron-impurity scattering are included, we find that while these scattering rates are in qualitative agreement, in general quantitative agreement is lacking. We also derive results for the quasiparticle lifetime within the BCS framework with impurity scattering, which makes it clear that impurity scattering is suppressed for electrons near the Fermi surface in the superconducting state.

Observation by HVEM of the martensite transformation and the superconducting transition in Nb3Sn

1988 ◽  
Vol 46 ◽  
pp. 788-789
Author(s):  
M. A. Kirk ◽  
M. C. Baker ◽  
B. J. Kestel ◽  
H. W. Weber
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Superconducting State ◽  
Martensite Transformation ◽  
Sputter Deposition ◽  
Diffusion Reaction ◽  
Solute Diffusion ◽  
Superconducting Transition ◽  
Twin Boundaries ◽  
Martensite Structure

It is well known that a number of compound superconductors with the A15 structure undergo a martensite transformation when cooled to the superconducting state. Nb3Sn is one of those compounds that transforms, at least partially, from a cubic to tetragonal structure near 43 K. To our knowledge this transformation in Nb3Sn has not been studied by TEM. In fact, the only low temperature TEM study of an A15 material, V3Si, was performed by Goringe and Valdre over 20 years ago. They found the martensite structure in some foil areas at temperatures between 11 and 29 K, accompanied by faults that consisted of coherent twin boundaries on {110} planes. In pursuing our studies of irradiation defects in superconductors, we are the first to observe by TEM a similar martensite structure in Nb3Sn.Samples of Nb3Sn suitable for TEM studies have been produced by both a liquid solute diffusion reaction and by sputter deposition of thin films.

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