Stripe order at low temperatures in La{2-x}Sr{x}NiO4 for 1/3 < x < 1/2

TL;DR

This study investigates stripe order phenomena in La{2-x}Sr{x}NiO4 for 1/3 < x < 1/2 using neutron scattering, revealing incommensurate stripe order and its dependence on hole concentration and temperature.

Contribution

It provides detailed experimental insights into stripe order behavior in La{2-x}Sr{x}NiO4 within a specific doping range, highlighting the relationship between incommensurability and hole concentration.

Findings

Stripe order exists at low temperatures for x > 1/3.

Incommensurability b5 is approximately linear in hole concentration.

Charge and spin ordering temperatures peak at n_h = 1/3.

Abstract

Stripe order in La{2-x}Sr{x}NiO4 beyond x = 1/3 was studied with neutron scattering technique. At low temperatures, all the samples exhibit hole stripe order. Incommensurability \epsilon of the stripe order is approximately linear in the hole concentration n_h = x + 2\delta up to x = 1/2, where \delta denotes the off-stoichiometry of oxygen atoms. The charge and spin ordering temperatures exhibit maxima at n_h = 1/3, and both decrease beyond n_h > 1/3. For 1/3 < n_h < 1/2, the stripe ordering consists of the mixture of the \epsilon = 1/3 stripe order and the n_h = 1/2 charge/spin order.