Three Component Model of Pseudogap State for Hihg Temperature Superconductors

TL;DR

This paper proposes a three-component model for the pseudogap state in high-temperature superconductors, highlighting local pairing mechanisms involving Jahn-Teller polarons and holes, and discusses experimental evidence supporting this model.

Contribution

It introduces a novel three-component model explaining pseudogap phenomena in cuprate HTS, emphasizing local pairing and charge dimensional crossover.

Findings

Development of zero-dimensional superconducting fluctuations below T*

Crossover from three-dimensional to two-dimensional charge behavior at T*

Experimental evidence of local hole-Jahn-Teller polaron pairing

Abstract

Three Component Model of Pseudogap State for Hihg Temperature Superconductors G.G.Sergeeva (Kharkov Institute of Physics and Technology, Ukraine), V.L.Vakula (Institute for Low Temperature Physics and Engineering, Ukraine) Abstract For underdoped cuprate HTS three component model of pseudogap state is proposed where it is shown that at T<T* the zero-dimensional superconducting fluctuations are developing in copper-oxygen planes in the addition to Jahn-Teller small polarons (with total spin 1/2) and holes. These superconducting fluctuations are the local "hole-Jahn-Teller small polaron" pairs with BCS pairing. At T<T* (T* is the pseudogap temperature) the crossover of three-dimensional charge to "two-dimensional" one occurs, and polaron shift of the energy leads to the compensation of Coulomb repulsion between the polaron and the hole, and to their on-site attraction in in copper-oxygen planes. Some experimental evidences of the local "hole-Jahn-Teller small polaron" pairing at T<T* are discussed.