Observation of magnetic order in La_{1.9}Sr_{0.1}CuO_{4} from two-magnon Raman scattering

TL;DR

This study observes magnetic ordering in La_{1.9}Sr_{0.1}CuO_{4} via two-magnon Raman scattering, revealing temperature-dependent magnetic behavior and weak quantum fluctuations, differing from the parent compound La_2CuO_4.

Contribution

First observation of magnetic order in La_{1.9}Sr_{0.1}CuO_{4} using two-magnon Raman scattering, with analysis of magnetic interactions and fluctuations.

Findings

Magnetic order appears below 37 K in La_{1.9}Sr_{0.1}CuO_{4}

Superexchange constant J is approximately 1052 cm^{-1}

Quantum fluctuations are weak in the system.

Abstract

We reported two-magnon Raman scattering from La_{1.9}Sr_{0.1}CuO_4, which has a suppressed Tc=12 K, as the temperature is lowered below 37 K and an ordered spin phase is formed. The two-magnon Raman intensity increases with decreasing temperature. The magnetic scattering in La_{1.9}Sr_{0.1}CuO_4 is totally different from that reported in the parent compound La_2CuO_4. We analyze the line shape of the two-magnon scattering within the traditional Loudon-Fleury theory and find the superexchange constant J=1052 cm^{-1}. The calculation of the frequency moment suggests that the quantum fluctuations are very weak in the system. The room temperature Raman scattering from La_2CuO_4 is also measured. Strong features appear in the one-phonon spectrum at the frequencies of the longitudinal optical (LO) infrared modes which we suggest become Raman active through a Fr\"{o}hlich-interaction.