Spin fluctuations and the "strange metal" behavior of a weakly doped antiferromagnet

TL;DR

This paper investigates how spin fluctuations in a weakly doped 2D antiferromagnet can produce 'strange metal' behaviors observed in underdoped cuprates, highlighting the role of non-pole Green's functions.

Contribution

It introduces a phenomenological model considering sublattice-restricted carrier movement and spin fluctuations, explaining anomalous spectral properties and 'strange metal' behavior.

Findings

Spin fluctuations cause non-pole-like spectral features.

Model reproduces maxima at ${f k}=(rac{ ext{pi}}{2},rac{ ext{pi}}{2})$.

Fluctuations may explain 'strange metal' properties in cuprates.

Abstract

We analyze the spectral properties of a phenomenological model for a weakly doped two-dimensional antiferromagnet, in which the carriers move within one of the two sublattices where they were introduced. Such a constraint results in the free carrier spectra with the maxima at ${\bf k}=(\pm \pi /2 ,\pm \pi /2)$ observed in some cuprates. We consider the spectral properties of the model by taking into account fluctuations of the spins in the antiferromagnetic background. We show that such fluctuations lead to a non-pole-like structure of the single-hole Green's function and these fluctuations can be responsible for some anomalous "strange metal" properties of underdoped cuprates in the nonsuperconducting regime.