The H-T and P-T phase diagram of the superconducting phase in Pd:Bi${}_2$Te${}_3$

Abstract

We study the magnetic field vs temperature ($H$--$T$) and pressure vs temperature ($P$--$T$) phase diagram of the $T_c\approx 5.5$~K superconducting phase in Pd${}_x$Bi${}_2$Te${}_3$ ($x\approx 1$) using electrical resistivity versus temperature measurements at various applied magnetic fields ($H$) and magnetic susceptibility versus temperature measurements at various applied magnetic fields ($H$) and pressure ($P$). The $H$--$T$ phase diagram has an initial upward curvature as observed in some unconventional superconductors. The critical field extrapolated to $T=0$~K is $H_c(0)\approx 6$--$10$~kOe. The $T_c$ is suppressed approximately linearly with pressure at a rate $d{T}_c/dP\approx -0.28$~K/GPa.

4 pages, 6 figures, To appear in Journal of Superconductivity and Novel Magnetism