Effect of pressure on charge density wave order in the cuprate superconductor Nd-LSCO

A phase of charge-density-wave (CDW) order is present in all hole-doped cuprates near a doping p = 0.12. As it competes with superconductivity, this CDW order causes a suppression of T_c near p = 0.12, visible as a dip in the T_c vs p dome of various cuprates.
In YBCO, the T_c dip is removed by application of pressure, which led to the proposal that pressure suppresses CDW order in that material [1], later confirmed directly by x-ray measurements [2].
Here we investigate the effect of pressure on CDW order in the cuprate La_1.6-xNd_0.4Sr_xCuO₄ (Nd-LSCO), by looking at signatures of the Fermi-surface reconstruction caused by CDW order, namely a drop in the Hall coefficient at low temperature, to negative values [3,4]. We find that pressures up to 2 GPa have little effect on the Hall coefficient in under doped region, showing that the CDW phase is not suppressed by pressure.
We will contrast the insensitivity of CDW order to pressure in Nd-LSCO to the rapid lowering of the pseudogap critical point p* by pressure in that material [5], showing that CDW and pseudogap are distinct phases.
[1] O. Cyr-Choiniere et al., arXiv:1503.02033
[2] S. M. Souliou et al., arXiv:1709.10501
[3] D. LeBoeuf et al., Nature 450, 533
[4] D. LeBoeuf et al., Phys. Rev. B 83, 054506
[5] N. Doiron-Leyraud et al., to appear