Synthesis novel (Au Cu1-)Sr2CaCu2O superconductor under high pressure

• A novel gold-based superconductor (AuxCu1-x)Sr₂CaCu₂Oy was synthesized at high • pressure. • This is the first Au-based superconductor in a non-lanthanide system. • Structural analysis confirmed successful Au³⁺ incorporation and lattice expansion. • The superconducting transition temperature (Tc) was determined to be 29.7 K. A novel superconductor of (AuxCu1-x)Sr2CaCu2Oy ((Au,Cu)-1(Sr)212) was synthesized by oxidation of Au at 5.5 GPa and 980-1030°C. The crystal structure of (Au,Cu)-1(Sr)212 was analyzed using X-ray diffraction (XRD) and field emission transmission electron microscopy (FE-TEM). From XRD results, the (Au,Cu)-1(Sr)212 with lattice parameters of a ≈ 3.86 Å, c ≈ 10.98 Å, respectively, were observed. A superconducting signal was observed below T = 29.7 K in the magnetic susceptibility measurements.