The Striped Phase in Presence of Disorder and Lattice Potentials

TL;DR

This paper investigates how disorder and lattice effects influence the striped phase and spin fluctuations in cuprates and nickelates, using a phenomenological model and renormalization group analysis.

Contribution

It introduces a discrete quantum string model with disorder and derives RG equations to identify three distinct phases, enhancing understanding of stripe behavior in complex materials.

Findings

Identification of three phases: quantum membrane, lattice-pinned flat, and disorder-pinned.

Good agreement with experimental measurements on nickelates and cuprates.

Provides a theoretical framework linking disorder, lattice effects, and stripe phenomena.

Abstract

We study the influence of disorder and lattice effects on the striped phase and the incommensurate spin fluctuations of the cuprates and nickelates. Starting from a phenomenological model of a discrete quantum string on a lattice with disorder, we derive the renormalisation group equations in leading order in the lattice and disorder strength. Three regimes are identified, the quantum membrane phase, the flat phase pinned by the lattice and the disorder pinned phase. We compare our results with measurements on nickelates and cuprates and find good agreement.