$^{17}$O NMR study of charge ordered La$_{1.885}$Sr$_{0.115}$CuO$_4$

TL;DR

This study uses $^{17}$O NMR to investigate charge order and spin fluctuations in La$_{1.885}$Sr$_{0.115}$CuO$_4$, revealing charge order enhances incommensurate Cu spin fluctuations below 80 K.

Contribution

First to isolate $^{17}$O NMR signals at planar sites in this compound under a magnetic field, linking charge order with spin fluctuation enhancement.

Findings

Charge order appears below approximately 80 K.

Charge order correlates with increased incommensurate Cu spin fluctuations.

Successful $^{17}$O NMR signal isolation at planar sites.

Abstract

We successfully isolated the $^{17}$O NMR signals at the planar sites in La$_{1.885}$Sr$_{0.115}$CuO$_4$ ($T_{c}=30$ K) by applying an external magnetic field along the Cu-O-Cu bond direction of a single crystal. We demonstrate that charge order enhances incommensurate Cu spin fluctuations below $T_{charge} \simeq 80$ K.