Quantum spin liquid in Sr_2CuO_3 induced by Acoustic Phonons

TL;DR

This paper presents a theoretical study of phonons and spinons in Sr₂CuO₃, revealing gaps in excitation spectra and explaining magnetic moment formation via quantum spin liquid freezing, aligning well with experimental data.

Contribution

It introduces a non-adiabatic interaction model for magnetic and elastic subsystems in Sr₂CuO₃, providing new insights into its excitation spectra and magnetic properties.

Findings

Identified two gaps in triplet excitation spectrum.

Estimated bond defect concentration matches experimental data.

Explained magnetic moment formation as quantum spin liquid freezing.

Abstract

We have carried out theoretical studies of the phonons and spinons excitation spectra of $Sr_2CuO_3 $ in term of a one-dimensional model with non-adiabatic interaction magnetic and elastic subsystems using continuous time Monte Carlo method. Two gaps in triplet excitation spectrum are found. The bond defects concentration estimated is well agreement with the experimental data. The formation of magnetic moment on site at low temperature $T_N \sim 5 K$ is caused by freezing quantum spin liquid with correlation radius of antiferromagnetic ordering $\xi/a \sim 300 - 500$