Effect of impurity scattering on a (d+s)-wave superconductor

1995 ◽  
Vol 52 (18) ◽  
pp. 13576-13584 ◽  
Author(s):  
Heesang Kim ◽  
E. J. Nicol
Keyword(s):  
Impurity Scattering ◽  
S Wave

scholarly journals Effect of Born and unitary impurity scattering on the Kramer–Pesch shrinkage of a vortex core in an s-wave superconductor

2013 ◽  
Vol 484 ◽  
pp. 69-73 ◽  
Author(s):  
Nobuhiko Hayashi ◽  
Yoichi Higashi ◽  
Noriyuki Nakai ◽  
Hisataka Suematsu
Keyword(s):  
Vortex Core ◽  
Impurity Scattering ◽  
S Wave

THERMAL TRANSPORT OF MgB2 SUPERCONDUCTORS: INTERPLAY BETWEEN ELECTRON AND LATTICE-IMPURITY SCATTERING

2007 ◽  
Vol 21 (26) ◽  
pp. 4517-4536 ◽  
Author(s):  
DINESH VARSHNEY ◽  
M. NAGAR ◽  
K. K. CHOUDHARY
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Phonon Scattering ◽  
Theoretical Calculations ◽  
Impurity Scattering ◽  
Metallic Phase ◽  
Scattering Mechanism ◽  
S Wave ◽  
Lattice Contribution ◽  
Relaxation Time Approximation

We use the Kubo model to calculate the lattice contribution to the thermal conductivity (κph) in MgB 2 superconductors. The theory is formulated when heat transfer is limited by the scattering of phonons from defects, grain boundaries, charge carriers, and phonons. The lattice thermal conductivity in normal state of MgB 2 superconductors dominates and is an artifact of strong phonon-impurity and -phonon scattering mechanism. Later on, the electronic contribution to the thermal conductivity (κe) is calculated within relaxation time approximation for π and σ band carriers with s wave symmetry. Such an estimate sets an upper bound on κe and is about 30% of the total heat transfer at room temperature. The validity of the Wiedemann Franz law is also examined and an enhanced Lorenz number is obtained. Both these channels for heat transfer are clubbed and κ tot develops a broad peak at about 120 K, before falling off at higher temperatures weakly. The anomalies reported are well-accounted in terms of the scattering mechanism by phonon and electron with impurities. It is shown that the behavior of the thermal conductivity is determined by competition among the several operating scattering mechanisms for the heat carriers and a balance between electron and lattice contributions. The contribution of carriers toward κ is substantial and is due to the fact that the carriers are condensed and do not carry entropy. We include comparisons with other theoretical calculations on κe and available experimental data. The numerical analysis of heat transfer in the metallic phase of MgB 2 shows similar results as those revealed from experiments.

Impurity scattering in d+s wave superconductivity

1996 ◽  
Vol 33 (4) ◽  
pp. 309-314 ◽  
Author(s):  
M. T Béal-Monod ◽  
K Maki
Keyword(s):  
Impurity Scattering ◽  
S Wave

Microstructure and Temperature Dependence of Microwave Penetration Depth of Ag-YBa2Cu3O7-δ Thin Films

1998 ◽  
Vol 526 ◽  
Author(s):  
Davinder Kaur ◽  
R. Pinto
Keyword(s):  
Thin Films ◽  
Temperature Dependence ◽  
Penetration Depth ◽  
Impurity Scattering ◽  
Bcs Theory ◽  
S Wave ◽  
Microstrip Resonator ◽  
Wave Pairing ◽  
Film Microstructure ◽  
D Wave

AbstractWe report the measurements of the magnetic penetration depth λ(T) of Ag-doped YBa2Cu3O7-δ (YBCO) thin films in the film thickness range 1500-4000A and temperature range 18-88K. The films are insitu grown by laser ablation on LaAlO3 <100> single crystal substrates. The penetration depth measurements are performed by microstrip resonator technique. A correlation of λ(T) with the film microstructure observed with Atomic Force Microscopy has shown that λ(T) depends critically on the film microstructure. Temperature dependence of λ(T) has also been studied for best quality films.The experimental results are discussed in terms of BCS theory (s-wave pairing) and d-wave Pairing with and without impurity scattering. The results are found to be best fitted to the d-wave model in dirty limit with impurity scattering. Near Tc, we have also compare the (3D) XY critical regime and the Ginzburg-Landau (GL) behaviour.

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.

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