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

Condensed Matter

Mukhin, Sergei¹ 

[1] Theoretical Physics and Quantum Technologies Department, National University of Science and Technology MISiS, Leninskiy ave. 4, 119049 Moscow, Russia

关键词: hidden order;    Cooper-pairing ‘glue’;    instantons;    Eliashberg equations;    high-temperature superconductivity;   

DOI  :  10.3390/condmat3040039

学科分类：凝聚态物理

来源: mdpi

【 摘 要 】

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 someT 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.

【 授权许可】

CC BY