Destruction of Neel order and local spin spirals in insulating La_{2-x}Sr_xCuO_4

TL;DR

This paper develops an effective field theory from the t-J model to analyze spin dynamics in insulating La_{2-x}Sr_xCuO_4, revealing how hole localization causes Neel order destruction and matches neutron scattering data.

Contribution

It introduces a new effective field theory for spin dynamics in La_{2-x}Sr_xCuO_4 and links the Neel order destruction to hole localization length, supported by Monte Carlo simulations.

Findings

Neel order is destroyed by hole localization effects.

A phase transition occurs at 2% doping consistent with conductivity data.

Spin vortex-antivortex pairs are intrinsic to the spin-glass state.

Abstract

Starting from the t-J model, we derive an effective field theory describing the spin dynamics in the insulating phase of La_{2-x}Sr_xCuO_4, x < 0.055, at low temperature. Using Monte Carlo simulations, we show that the destruction of Neel order is driven by the single-hole localization length kappa. A phase transition at 2% doping is consistent with the value of kappa known from the variable range hopping conductivity. The static spin structure factor obtained in our calculations is in perfect agreement with neutron scattering data over the whole range of doping. We also demonstrate that topological defects (spin vortex-antivortex pairs) are an intrinsic property of the spin-glass ground state.