Antiferromagnetic interactions and the superconducting gap function.

@article{Radtke1996AntiferromagneticIA,
  title={Antiferromagnetic interactions and the superconducting gap function.},
  author={Radtke and Liechtenstein and Yakovenko and S DasSarma},
  journal={Physical review. B, Condensed matter},
  year={1996},
  volume={53 9},
  pages={
          5137-5140
        }
}
Spin-fluctuation-mediated superconductivity is conventionally associated with d_{x^2-y^2} pairing. We show that a generalized model of antiferromagnetic spin fluctuations in three dimensions may also yield a state with formal ``s-wave'' (A_{1g}) symmetry but with line nodes at k_z \approx \pm \pi / 2c. We study this new state within both BCS and Eliashberg theories using a realistic band structure and find that it is more stable than the d_{x^2-y^2} (B_{1g}) state over a wide range of… 
7 Citations

Topics from this paper

Spin Fluctuation Effects in High-T c Superconductors
By using a theory that includes antiferromagnectic short-ranged correlations, recent experiments on the high-transition temperature (high-T c ) cuprate superconductors like photoemission, tunneling
Theory for the interdependence of high-Tc superconductivity and dynamical spin fluctuations
We analyze the doping and temperature dependence of the quasi particle excitation spectrum of the 2D one band Hubbard model in the normal and superconducting state using the fluctuation exchange
Coexistence of magnetism and superconductivity in at−Jbilayer
We investigate coexistence of antiferromagnetic and superconducting correlations in bilayered materials using a two-dimensional t-J model with couplings across the layers using variational Monte
Conductivity anisotropy and pseudogap in the microwave response of high-Tc superconductors
Results of investigating the temperature dependences of the surface impedance Z(T) = R(T) + iX(T) and complex conductivity σ(T) = σ'(T) – iσ''(T) in the ab-planes and along the c-axis of high-Tc
A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases
Abstract The Van Hove singularity (VHS) provides a paradigm for the study of the role of peaks in the density of states (dos) on electronic properties. More importantly, it appears to play a major
Anisotropy of microwave conductivity in the superconducting and normal states of YBa2Cu3O7−x: 3D-2D crossover
The imaginary parts of microwave conductivity σ″(T<Tc) and resistivity ρ (T)=1/σ(T>Tc) along (σab″ and ρab) and across and (σ c″ and ρc the cuprate ab planes of a YBa2Cu3O7−x crystal with the oxygen
Voltage dependence of a stochastic model of activation of an alpha helical S4 sensor in a K channel membrane.
  • S. R. Vaccaro
  • Chemistry, Medicine
    The Journal of chemical physics
  • 2011
TLDR
For each depolarizing potential, the calculated time dependence of the survival probabilities of the closed states of an alpha helical S4 sensor are in accord with an empirical model of the ionic and gating currents recorded during the activation process.

References

SHOWING 1-10 OF 27 REFERENCES
s-wave superconductivity from an antiferromagnetic spin-fluctuation model for bilayer materials.
TLDR
It is shown that in bilayer materials, due to nearly perfect antiferromagnetic spin correlations between the planes, the stronger instability is with respect to a superconducting state whose order parameters in the even and odd plane-bands have opposite signs, while having both two-dimensional $s$-symmetry.
Antiferromagnetic Spin Fluctuations and Superconductivity in Two-Dimensional Metals —A Possible Model for High Tc Oxides
Spin fluctuations in antiferromagnetic and nearly antiferromagnetic two dimensional (square lattice) itinerant electron systems, as a possible model for high T c superconductors, are investigated by
Toward a theory of high-temperature superconductivity in the antiferromagnetically correlated cuprate oxides.
We show that the retarded interaction between quasiparticiles on a 2D square lattice induced by the exchange of antiferromagnetic paramagnons leads uniquely to a transition to a superconducting state
Antiferromagnetic spin fluctuations and superconductivity in high Tc oxides
Abstract It is shown that anomalous physical properties of high T c oxides as observed in the electrical resistivity, infrared conductivity, NMR relaxation rate, etc. above their transition
Phenomenological model of nuclear relaxation in the normal state of YBa2Cu3O7.
  • Millis, Monien, Pines
  • Materials Science, Medicine
    Physical review. B, Condensed matter
  • 1990
A phenomenological model of a system of antiferromagnetically correlated spins is shown to give a good quantitative description of NMR, nuclear-quadrupole-resonance, and Knight-shift measurements on
Superconducting order parameter in bilayer cuprates: Occurrence of pi phase shifts in corner junctions.
  • Liu, Levín, Malý
  • Physics, Medicine
    Physical review. B, Condensed matter
  • 1995
TLDR
The order-parameter symmetry in bilayer cuprates such as Y-Ba-Cu-O, where interesting [pi] phase shifts have been observed in Josephson junctions is studied, is shown to be a consequence of repulsive interactions, independent of whether a magnetic mechanism is operative.
The case for dx2 − y2 pairing in the cuprate superconductors
Abstract The nature of the orbital structure of the pairs in the superconducting phase of the high-temperature superconducting cuprates remains one of the central questions in this field. Here we
Phenomenological theory of unconventional superconductivity
This article is a review of recent developments in the phenomenological description of unconventional superconductivity. Starting with the BCS theory of superconductivity with anisotropic Cooper
Evidence for an unconventional superconducting order parameter in YBa2Cu3O6.9.
  • Brawner, Ott
  • Physics, Medicine
    Physical review. B, Condensed matter
  • 1994
TLDR
Measurements of the dynamic resistance of a dc SQUID formed by two contacts between two different edges of a single crystal of YBa[sub 2]Cu[sub 3]O[sub 6.9] and a Nb block find a phase difference of 160[plus minus]30 between the oscillations of the composite SQUID and those of the SQUID's formed by Nb-Nb junctions.
Spin-fluctuation-induced superconductivity in the copper oxides: A strong coupling calculation.
TLDR
A strong coupling calculation of spin-fluctuation-induced superconductivity for YBa 2 Cu 3 O 7 is carried out using the experimentally determined spin excitation spectrum and it is found that while lifetime effects substantially reduce T c from its value calculated in a weak coupling approximation, it is still possible for spin fluctuations to give rise to high-temperaturesuperconductivity.
...
1
2
3
...