Anisotropic thermoelectric power in ${\mathrm{YBa}}_2$${\mathrm{Cu}}_3$${\mathrm{O}}_{7\mathrm{-}\mathit{x}}$ single crystals under pressures up to 8 GPa

The thermoelectric power (TEP) of ${\mathrm{YBa}}_2$${\mathrm{Cu}}_3$${\mathrm{O}}_{7\mathrm{-}\mathit{x}}$ single crystals has been measured as a function of pressure up to 8 GPa. The ab-plane TEP decreases monotonically. The c-axis TEP shows a broad maximum around 1.5 GPa, followed by a decrease with a further increase in pressure.