Origin of strange metallic phase in cuprate superconductors

TL;DR

This paper proposes that the strange metallic phase in cuprate superconductors arises from strong electron interactions and specific electronic level crossings, explaining key experimental observations like resistivity shifts and spectral weight transfer.

Contribution

It introduces a theoretical framework linking electron interactions and energy level crossings to the strange metallic phase in cuprates, providing explanations for experimental phenomena.

Findings

Explains the origin of the strange metallic phase.

Accounts for shifts in T-linear resistivity.

Describes spectral weight transfer in spectroscopic data.

Abstract

The origin of strange metallic phase is shown to exist due to these two conditions---(i) the electrons are strongly interacting such that there are no band and Mott-Hubbard gaps, and (ii) the electronic energy levels are crossed in such a way that there is an electronic energy gap between two energy levels associated to two different wave functions. The theory is also exploited to explain (i) the upward- and downward-shifts in the $T$-linear resistivity curves, and (ii) the spectral weight transfer observed in the soft X-ray absorption spectroscopic measurements of the La-Sr-Cu-O Mott insulator.