Journal ArticleDOI
Inelastic scattering and pair breaking in anisotropic and isotropic superconductors.
TLDR
The ratio g of the couplings of the boson fluctuations to the pairing and normal electron self-energies is an important parameter for anisotropic and isotropic superconductors and applications to heavy-fermion superconductor materials are discussed.Abstract:
The pair-breaking effect of inelastic scattering of electrons off boson fluctuations is examined for anisotropic and isotropic superconductors. We show that the ratio g of the couplings of the boson fluctuations to the pairing and normal electron self-energies is an important parameter. Phonon-mediated s-wave superconductivity corresponds to a value of g=1, and spin-fluctuation-mediated d-wave superconductivity to gl1. For gl1, there is a critical frequency ${\ensuremath{\omega}}_{c}$\ensuremath{\sim}${T}_{c}$${e}^{1/g}$ in the boson spectrum: bosons at \ensuremath{\omega}${\ensuremath{\omega}}_{c}$ are pair breaking. We give an approximate expression for the pair-breaking effect of low-lying bosons. We also study the dependence of ${T}_{c}$ upon g in an Einstein model in which the boson spectral weight is concentrated at a frequency ${\ensuremath{\omega}}_{E}$. We show that for fixed electron-boson coupling, ${T}_{c}$/${\ensuremath{\omega}}_{E}$ decreases rapidly as g decreases from 1, and for g\ensuremath{\ne}1 ${T}_{c}$/${\ensuremath{\omega}}_{E}$ saturates at a low value as the coupling tends to infinity. Applications to heavy-fermion superconductors and to the new high-${T}_{c}$ materials are discussed.read more
Citations
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Journal ArticleDOI
The superconductivity of Sr 2 RuO 4 and the physics of spin-triplet pairing
TL;DR: In this paper, a summary and evaluation of the experimental properties of spin-triplet superconductivity in a quasi-two-dimensional Fermi liquid is presented. But the authors do not consider the effect of symmetry-breaking magnetic fields on the phase diagram.
Journal ArticleDOI
Magnetically mediated superconductivity in heavy fermion compounds
Neil D. Mathur,F. M. Grosche,Stephen Julian,I. R. Walker,D. M. Freye,R. K. W. Haselwimmer,G. G. Lonzarich +6 more
TL;DR: In this article, it was shown that the charge carriers are bound together in pairs by magnetic spin-spin interactions in heavy fermion superconductors CePd2Si2 and CeIn3.
Journal ArticleDOI
Superconductivity on the border of itinerant-electron ferromagnetism in UGe2
Siddharth S. Saxena,Siddharth S. Saxena,Siddharth S. Saxena,P. Agarwal,K. Ahilan,F. M. Grosche,R. K. W. Haselwimmer,Markus J. Steiner,Edward N. Pugh,I. R. Walker,Stephen Julian,P. Monthoux,Gilbert G. Lonzarich,Andrew Huxley,I. Sheikin,Daniel Braithwaite,Jacques Flouquet +16 more
TL;DR: The observation of superconductivity on the border of ferromagnetism in a pure system, UGe 2, which is known to be qualitatively similar to the classic d-electron ferromagnets, is reported.
Journal ArticleDOI
Electrodynamics of high- T c superconductors
Dmitri Basov,Thomas Timusk +1 more
TL;DR: In this article, a review of the electromagnetic response of high-Tc superconductors using terahertz, infrared, and optical spectroscopies is presented, with an emphasis on conceptual issues, including evolution of the electronic spectral weight in doped Mott-Hubbard insulators, the d-wave superconducting energy gap and the normal-state pseudogap, anisotropic superfluid response, electronic phase segregation, emergence of coherent electronic state as a function of both temperature and doping, the vortex state, and the energetics of the super
Journal ArticleDOI
Superconductivity on the Border of Weak Itinerant Ferromagnetism in UCoGe
N.T. Huy,A. Gasparini,D.E. de Nijs,Yingkai Huang,J.C.P. Klaasse,T. J. Gortenmulder,A. de Visser,A. Hamann,T. Görlach,Hilbert von Löhneysen +9 more
TL;DR: The proximity to a ferromagnetic instability, the defect sensitivity of T(s), and the absence of Pauli limiting, suggest triplet superconductivity mediated by criticalferromagnetic fluctuations.
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