Effects of nonmagnetic impurity atoms on the spin-density-wave model of high-temperature superconductivity

1990 ◽  
Vol 41 (10) ◽  
pp. 6479-6487 ◽  
Author(s):  
Hiroyuki Mori ◽  
Tatsuya Nagao ◽  
Fumiko Yonezawa
Keyword(s):  
High Temperature ◽  
Spin Density ◽  
High Temperature Superconductivity ◽  
Density Wave ◽  
Spin Density Wave ◽  
Wave Model ◽  
Nonmagnetic Impurity ◽  
Impurity Atoms

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.

scholarly journals MICROMAGNETISM IN URu2Si2 AND HIGH TEMPERATURE SUPERCONDUCTORS

2002 ◽  
Vol 16 (11n12) ◽  
pp. 1667-1671 ◽  
Author(s):  
ATTILA VIROSZTEK ◽  
KAZUMI MAKI ◽  
BALÁZS DÓRA
Keyword(s):  
High Temperature ◽  
Neutron Scattering ◽  
Spin Density ◽  
High Temperature Superconductors ◽  
Density Wave ◽  
Spin Density Wave ◽  
Scattering Data ◽  
Density Waves ◽  
Pseudogap Phase ◽  
Optical Dichroism

It has been proposed, that unconventional density waves (UDW) are possible candidates for systems with hidden order parameter. Unlike in conventional density waves, no periodic modulation of either the charge-, or the spin-density is present in UDW, in spite of a clear thermodynamic signal. Although the unconventional spin density wave (USDW) has been suggested for the "antiferromagnetic" phase of URu2Si2 , the micromagnetism seen by neutron scattering has not been understood. We present here the calculation of the local spin density due to impurities in USDW, which describes quantitatively the neutron scattering data by Amitsuka et al. Further, we propose that the pseudogap phase in high temperature superconductors (HTSC) should also be USDW. Strong evidence for this are the micromagnetism seen by Sidis et al., and the optical dichroism seen by Campuzano et al.

Sign in / Sign up

Export Citation Format

Share Document