Higher superconducting transition temperature by breaking the universal pressure relation

Abstract

By investigating the bulk superconducting state via dc magnetization measurements, we have discovered a common resurgence of the superconductive transition temperatures (Tcs) of the monolayer Bi2Sr2CuO6+δ (Bi2201) and bilayer Bi2Sr2CaCu2O8+δ (Bi2212) to beyond the maximum Tcs (Tc-maxs) predicted by the universal relation between Tc and doping (p) or pressure (P) at higher pressures. The Tc of under-doped Bi2201 initially increases from 9.6 K at ambient to a peak at ~ 23 K at ~ 26 GPa and then drops as expected from the universal Tc-P relation. However, at pressures above ~ 40 GPa, Tc rises rapidly without any sign of saturation up to ~ 30 K at ~ 51 GPa. Similarly, the Tc for the slightly overdoped Bi2212 increases after passing a broad valley between 20-36 GPa and reaches ~ 90 K without any sign of saturation at ~ 56 GPa. We have therefore attributed this Tc-resurgence to a possible pressure-induced electronic transition in the cuprate compounds due to a charge transfer between the Cu 3d_(x^2-y^2 ) and the O 2p bands projected from a hybrid bonding state, leading to an increase of the density of states at the Fermi level, in agreement with our density functional theory calculations. Similar Tc-P behavior has also been reported in the trilayer Br2Sr2Ca2Cu3O10+δ (Bi2223). These observations suggest that higher Tcs than those previously reported for the layered cuprate high temperature superconductors can be achieved by breaking away from the universal Tc-P relation through the application of higher pressures.

13 pages, including 5 figures

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• Pressure-induced high-temperature superconductivity retained at ambient
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• Room-temperature skyrmion phase in bulk Cu2OSeO3 under high pressures
• Ab initio description of the Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ electronic structure
• The breakdown of both strange metal and superconducting states at a pressure-induced quantum critical point in iron-pnictide superconductors
• Superconducting and Pseudogap Transition Temperatures in High-Tc Cuprates and the $T_c$ Dependence on Pressure
• RSAVS superconductors: materials with a superconducting state that is robust against large volume shrinkage
• Crystal Growth and High-Pressure Effects of Bi-Based Superconducting Whiskers
• Crystal Growth of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ Whiskers from Pulverized Amorphous Precursors
• Reemergence of superconductivity in pressurized quasi-one-dimensional superconductor K2Mo3As3
• First principle prediction of structural distortions in the cuprates and their impact on the electronic structure
• Crossover from two-dimensional to three-dimensional superconducting states in bismuth-based cuprate superconductor
• Second Dome of Superconductivity in YBa${}_2$Cu${}_3$O${}_7$ at High Pressure
• Interlayer couplings in cuprates: structural origins, analytical forms, and structural estimators
• Effects of a k-dependent Hybridization on the Fermi Surface of an Extended $d-p$ Hubbard Model
• Magnetic phases of electron-doped infinite-layer Sr${}_{1-x}$La${}_x$CuO${}_2$ from first-principles density functional calculations
• Enhancing long-range order in disordered two-band s-wave superconductors
• Universal quantum transition from superconducting to insulating states in pressurized Bi2Sr2CaCu2O8+δ superconductors