The Temperature Evolution of the Out-of-Plane Correlation Lengths of Charge-Stripe Ordered La(1.725)Sr(0.275)NiO(4)

TL;DR

This study investigates how the out-of-plane correlation lengths of charge stripes in La(1.725)Sr(0.275)NiO(4) evolve with temperature, revealing different broadening behaviors linked to magnetic and charge order competition.

Contribution

It provides new insights into the temperature-dependent magnetic order and out-of-plane correlation lengths in stripe-ordered nickelate materials.

Findings

Broadening of magnetic Bragg peaks with cooling.

Different broadening behaviors for odd and even l peaks.

Competition between magnetic and charge order influences peak broadening.

Abstract

The temperature dependence of the magnetic order of stripe-ordered La(1.725)Sr(0.275)NiO(4) is investigated by neutron diffraction. Upon cooling, the widths if the magnetic Bragg peaks are observed to broaden. The degree of broadening is found to be very different for l = odd-integer and l = even-integer magnetic peaks. We argue that the observed behaviour is a result of competition between magnetic and charge order.