Freezing of spin dynamics and omega/T scaling in underdoped cuprates

TL;DR

This paper presents a theoretical framework explaining omega/T scaling and the emergence of a central peak in spin dynamics of underdoped cuprates, aligning with recent neutron scattering experiments.

Contribution

It introduces a memory function approach with temperature-independent static correlations and damping to model spin dynamics, explaining experimental observations.

Findings

Omega/T scaling observed in experiments is reproduced by the model.

The central peak at low temperatures is explained within the same theoretical framework.

The approach aligns well with recent neutron scattering data on underdoped cuprates.

Abstract

The memory function approach to spin dynamics in doped antiferromagnetic insulator combined with the assumption of temperature independent static spin correlations and constant collective mode damping leads to omega/T scaling in a broad range. The theory involving a non universal scaling parameter is used to analyze recent inelastic neutron scattering results for underdoped cuprates. Adopting modified damping function also the emerging central peak in low-doped cuprates at low temperatures can be explained within the same framework.