Magnetic-impurity effect in the spin-density-wave model of high-temperature superconductivity

1992 ◽  
Vol 46 (10) ◽  
pp. 6413-6421 ◽  
Author(s):  
Tatsuya Nagao ◽  
Hiroyuki Mori ◽  
Fumiko Yonezawa
Keyword(s):  
High Temperature ◽  
Spin Density ◽  
Magnetic Impurity ◽  
High Temperature Superconductivity ◽  
Density Wave ◽  
Spin Density Wave ◽  
Wave Model ◽  
Impurity Effect

Impurity effect on the two-dimensional spin density wave

1993 ◽  
Vol 48 (4) ◽  
pp. 497-501
Author(s):  
Ioan Bâldea ◽  
Marian Anghel
Keyword(s):  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
Impurity Effect ◽  
Two Dimensional

scholarly journals Superconductivity in the doped Hubbard model and its interplay with next-nearest hopping t′

Science ◽  
2019 ◽  
Vol 365 (6460) ◽  
pp. 1424-1428 ◽  
Author(s):  
Hong-Chen Jiang ◽  
Thomas P. Devereaux
Keyword(s):  
Hubbard Model ◽  
Charge Density ◽  
Spin Density ◽  
Charge Density Wave ◽  
Large Scale ◽  
Nearest Neighbor ◽  
High Temperature Superconductivity ◽  
Density Wave ◽  
Spin Density Wave ◽  
Hole Doping

The Hubbard model is widely believed to contain the essential ingredients of high-temperature superconductivity. However, proving definitively that the model supports superconductivity is challenging. Here, we report a large-scale density matrix renormalization group study of the lightly doped Hubbard model on four-leg cylinders at hole doping concentration δ = 12.5%. We reveal a delicate interplay between superconductivity and charge density wave and spin density wave orders tunable via next-nearest neighbor hopping t′. For finite t′, the ground state is consistent with a Luther-Emery liquid with power-law superconducting and charge density wave correlations associated with half-filled charge stripes. In contrast, for t′ = 0, superconducting correlations fall off exponentially, whereas charge density and spin density modulations are dominant. Our results indicate that a route to robust long-range superconductivity involves destabilizing insulating charge stripes in the doped Hubbard model.

scholarly journals Spin-Density Wave near the Vortex Cores in the High-Temperature SuperconductorBi2Sr2CaCu2O8+y

2011 ◽  
Vol 106 (5) ◽  
Author(s):  
A. M. Mounce ◽  
S. Oh ◽  
S. Mukhopadhyay ◽  
W. P. Halperin ◽  
A. P. Reyes ◽  
...  
Keyword(s):  
High Temperature ◽  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave

scholarly journals Negative Energy Antiferromagnetic Instantons Forming Cooper-Pairing ‘Glue’ and ‘Hidden Order’ in High-Tc Cuprates

2018 ◽  
Vol 3 (4) ◽  
pp. 39 ◽  
Author(s):  
Sergei Mukhin
Keyword(s):  
Spin Density ◽  
High Temperature Superconductivity ◽  
Density Wave ◽  
Spin Density Wave ◽  
Mean Field ◽  
Analytical Form ◽  
Negative Energy ◽  
Cooper Pairing ◽  
Hidden Order ◽  
The Green Function

An emergence of magnetic boson of instantonic nature, that provides a Cooper-‘pairing glue’, is considered in the repulsive ‘nested’ Hubbard model of superconducting cuprates. It is demonstrated that antiferromagnetic instantons of a spin density wave type may have negative energy due to coupling with Cooper pair condensate. A set of Eliashberg like equations is derived and solved self-consistently, proving the above suggestion. An instantonic propagator plays the role of the Green function of the pairing ‘glue’ boson. Simultaneously, the instantons defy condensation of the mean-field spin-density wave (SDW) order. We had previously demonstrated in analytical form that periodic chain of instanton-anti-instanton pairs along the axis of Matsubara time has zero scattering cross section for weakly perturbing external probes, like neutrons, etc., thus representing a ‘hidden order’. Hence, the two competing orders, superconducting and antiferromagnetic, may coexist (below some T c ) in the form of the superconducting order coupled to ‘hidden’ instantonic one. This new picture is discussed in relation with the mechanism of high temperature superconductivity.

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