# Charge-density-wave order takes over antiferromagnetism in Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6}$ superconductors

## TL;DR

This study reveals that charge density wave order replaces antiferromagnetic order in Bi$_2$Sr$_{2-x}$La$_x$CuO$_6$ superconductors, highlighting the complex interplay between charge, spin, and pseudogap phenomena in high-temperature superconductivity.

## Contribution

It demonstrates the emergence of charge density wave order induced by in-plane magnetic fields, surpassing antiferromagnetic order and scaling with the pseudogap temperature, providing new insights into cuprate phase competition.

## Key findings

- CDW order appears above the superconducting dome in Bi$_2$Sr$_{2-x}$La$_x$CuO$_6$.
- $T_{CDW}$ surpasses $T_N$ beyond a critical doping level.
- $T_{CDW}$ scales with the pseudogap temperature $T^*$.

## Abstract

Superconductivity appears in the cuprates when a spin order is destroyed, while the role of charge is less known. Recently, charge density wave (CDW) was found below the superconducting dome in YBa$_2$Cu$_3$O$_y$ when a high magnetic field is applied perpendicular to the CuO$_2$ plane, which was suggested to arise from incipient CDW in the vortex cores that becomes overlapped. Here, by $^{63}$Cu-nuclear magnetic resonance, we report the discovery of CDW induced by an in-plane field that does not create vortex cores in the plane, setting in above the dome in single-layered Bi$_2$Sr$_{2-x}$La$_x$CuO$_6$.The onset temperature $T_{\rm CDW}$ takes over the antiferromagnetic order temperature $T_{\rm N}$ beyond a critical doping level at which superconductivity starts to emerge, and scales with the psudogap temperature $T^{*}$. These results provide important insights into the relationship between spin order, CDW and the pseudogap, and their connections to high-temperature superconductivity.