# Pseudogap Induced by Superconducting Fluctuation in the d-p Model

@article{Kobayashi1999PseudogapIB, title={Pseudogap Induced by Superconducting Fluctuation in the d-p Model}, author={Akito Kobayashi and Atsushi Tsuruta and Tamifusa Matsuura and Yoshihiro Kuroda}, journal={Journal of the Physical Society of Japan}, year={1999}, volume={68}, pages={2506-2509} }

Using the d - p model, we demonstrate that the pseudogap, which is induced by the superconducting fluctuation, plays key roles in the determination of the phase diagram observed in high- T c superconducting materials. We take the pairing interaction mediated by the spin fluctuation and calculate the superconducting transition temperature T c , the NMR relaxation rate 1/ T 1 and the single-particle spectrum by treating both the superconducting fluctuation and spin fluctuation in a consistent…

## 21 Citations

Pseudogap and Superconducting Fluctuation in High-Tc Cuprates: Theory beyond 1-loop Approximation

- Physics
- 2004

The pseudogap phenomena induced by the SC fluctuation are investigated in details. We perform a calculation beyond the 1-loop approximation. The SC fluctuation is microscopically derived on the basis…

Antiferromagnetic and Superconducting Correlations on the d-p Model

- Physics
- 2000

We study superconducting fluctuation effects on the quasi-two-dimensional d - p model, which can describe significant features of high- T c superconducting cuprates. We adopt the fluctuation exchange…

Pseudogap Phenomena and Phase Diagram in the Two-Band Hubbard Model

- Physics
- 2001

High- T c superconducting materials (HTSC) have anomalous properties such as the pseudogap in the Hall coefficient, 1/ T 1 T and the density of states etc. First, including the effects of strong…

Pseudogap and strong correlation effects in the d–p model

- Physics
- 2002

Abstract The superconducting (SC) state and the anomalous metallic phase of the high- T c superconducting materials (HTSC) exist in the vicinity of the Mott insulator. In the metal near the Mott…

Phase Diagram of the Electron-Doped Cuprate Superconductors

- Physics
- 2002

We investigate the T –δ phase diagram of the electron-doped systems in high- T c cuprates where δ is doping rate. Taking the ingap state and the superexchange interaction J s , we calculate the…

Pseudo gap and superconducting gap in the d–p model

- Physics
- 2001

Abstract We investigate pseudo gap and superconducting gap by using the extended self-consistent t -matrix approximation (ESTA) in the d–p model. We take the pairing interaction mediated by the spin…

Pseudogap induced by antiferromagnetic spin correlation in high-temperature superconductors

- Physics
- 2001

The pseudogap phenomena observed on cuprate high temperature superconductors are investigated based on the exact diagonalization method on the finite cluster t - J model. The results show the…

Pseudogap due to Antiferromagnetic Fluctuations and the Phase Diagram of High-Temperature Oxide Superconductors

- Physics
- 2000

A reduction of the density of states near the Fermi energy in the normal state (pseudogap) of high-temperature oxide superconductors is examined on the basis of the two-dimensional tight-binding…

Numerical study on pseudogap phenomena in high-Tc cuprates

- Physics
- 2002

Abstract The pseudogap phenomena observed on cuprate high-temperature superconductors are investigated based on the finite-temperature Lanczos method on the 16 sites 4×4 cluster t – J model, which…

Temperature and interaction dependence of the electron spectrum in a 2D attractive hubbard model

- Physics
- 2004

We study the temperature and the interaction dependence of Green's function in the attractive Hubbard model using self-consistent T-matrix approximation (SCTMA). It is found that at low temperatures,…

## References

SHOWING 1-10 OF 32 REFERENCES

Superconductivity in the d- p Model – Effects of Quasi-2D Fluctuation –

- Physics
- 1998

Effects of quasi-2D fluctuations on superconducting transition mediated by spin-fluctuations via superexchange interactions in the d - p model are investigated based on the formalism first employed…

Charge-fluctuation-mediated superconductivity in the d-p model Strong-coupling calculation

- Physics
- 1996

Abstract Charge-fluctuation-mediated superconductivity in the simplest d-p model is investigated with the help of the auxiliary particle method together with the 1 N expansion theory. Transition…

Pairing interaction and superconducting transition temperature in the d-p model

- Physics
- 1997

Effective pairing interaction and superconducting transition temperature T c are investigated on the basis of the simplest d - p model by using the auxiliary particle method together with the 1/ N…

Superexchange interaction in the d-p model

- Physics
- 1998

An analytic form of superexchange interaction in the metallic phase of the d - p model simulating 2D electronic systems on CuO 2 planes of high- T c superconducting materials is obtained by using the…

Charge Fluctuation and Superconductivity in the d- p Model

- Physics
- 1992

We investigate effects of the repulsive interaction U p d between holes on the nearest-neighbor Cu- and O-sites in the d - p model with infinite repulsion on the Cu site using the auxiliary boson…

Strong Coupling Approach to the d-p Model on the Basis of Fermi Liquid Theory

- Physics
- 1998

We study the superconducting transition temperature T c of the bilayer d-p model with d x 2 - y 2 -wavelike attractive interaction based on the formalism first employed by Nozieres and Schmitt-Rink.…

Pairing Fluctuation Theory of Superconducting Properties in Underdoped to Overdoped Cuprates

- Physics
- 1998

Pseudogap phenomena in the cuprates are of interest not only because of the associated unusual normal-state properties, but more importantly because of the constraints which these phenomena impose on…

Spectroscopic evidence for a pseudogap in the normal state of underdoped high-Tc superconductors

- ChemistryNature
- 1996

IT is well known that BCS mean-field theory is remarkably successful in describing conventional superconductors. A central concept of BCS theory is the energy gap in the electronic excitation…

Finite temperature crossover in the d-p model

- Physics
- 1995

We investigate finite temperature properties of the U d -infinite d-p model in the auxiliary boson representation within the leading order approximation in the 1/ N -expansion. We obtain a unified…

Importance of phase fluctuations in superconductors with small superfluid density

- ChemistryNature
- 1995

THE superconducting state of a metal is characterized by a complex order parameter with an amplitude and a phase. In the BCS-Eliashberg mean-field theory1, which is a very good approximation for…