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We report thermopower measurements under hydrostatic pressure on the cupratesuperconductor La$_{1.6-x}$Nd$_{0.4}$Sr$_x$CuO$_4$ (Nd-LSCO), atlow-temperature in the normal state accessed by suppressing superconductivitywith a magnetic field up to $H = 31$ T. Using a newly developed AC thermopowermeasurement technique suitable for high pressure and high field, we track thepressure evolution of the Seebeck coefficient $S$. At ambient pressure and lowtemperature, $S/T$ was recently found to suddenly increase in Nd-LSCO at thepseudogap critical doping $p^{\star} = 0.23$, consistent with a drop in carrierdensity $n$ from $n = 1 + p$ above $p^{\star}$ to $n = p$ below. Under apressure of 2.0 GPa, we observe that this jump in $S/T$ is suppressed. Thisconfirms a previous pressure study based on electrical resistivity and Halleffect which found $dp^{\star}/dP \simeq - 0.01$ holes/GPa, thereby reinforcingthe interpretation that this effect is driven by the pressure-induced shift ofthe van Hove point. It implies that the pseudogap only exists when the Fermisurface is hole-like, which puts strong constraints on theories of thepseudogap phase. We also report thermopower measurements on Nd-LSCO andLa$_{1.8-x}$Eu$_{0.2}$Sr$_x$CuO$_4$ in the charge density-wave phase near $p\sim 1/8$, which reveals a weakening of this phase under pressure.

physical review research

Effect of pressure on the pseudogap and charge-density-wave phases of  the cuprate La$_{1.6-x}$Nd$_{0.4}$Sr$_x$CuO$_4$ probed by thermopower  measurements