Universal Behavior of the Spin-Echo Decay Rate in La_2CuO_4

TL;DR

This paper derives a theoretical expression for the spin-echo decay rate in quantum-critical square lattice antiferromagnets and confirms its accuracy with experimental data on La_2CuO_4.

Contribution

It provides a new theoretical formula for 1/T_2G in the quantum-critical regime, aligning well with experimental observations.

Findings

Theoretical expression matches experimental data for La_2CuO_4.

Supports quantum-critical behavior in square lattice antiferromagnets.

Validates the theoretical approach with recent experiments.

Abstract

We present a theoretical expression for the spin-echo decay rate, 1/T_2G, in the quantum-critical regime of square lattice quantum antiferromagnets. Our results are in good agreement with recent experimental data by Imai et al. [Phys. Rev. Lett. v.71, 1254 (1993)] for La_2CuO_4.