Pressure dependence of the superconducting transition temperature in the 94-K superconductor ${\mathrm{YBa}}_2$${\mathrm{Cu}}_3$${\mathrm{O}}_7$

We present the pressure dependence of the superconducting transition temperature for a variation of preparations of the 94-K superconductor Y-Ba-Cu-O. All preparations show a superconducting transition temperature near 90 K and a small positive derivative ${\mathrm{dT}}_c$/dP=0.07±0.02 K/kbar.