Phase diagram of pressure-induced high temperature superconductor La${}_3$Ni${}_2$O${}_{7+\delta }$

Abstract

We successfully synthesized samples of La${}_3$Ni${}_2$O${}_{7+\delta }$ ($\delta =-0.50$, $-0.16$, $0.00$, $+0.01$, and $+0.12$) and measured the resistance under extremely high pressures using a diamond anvil cell to establish the electronic phase diagram. A Mott insulating state appears at $\delta =-0.50$, where all Ni ions are divalent. With increasing oxygen content, superconductivity appears at $\delta =0.00$ and higher, above approximately 25 GPa, passing through Anderson localization at $\delta =-0.16$. The superconducting transition temperature $T_{\mathrm{c}}$ decreases with increasing pressures for both $\delta =0.00$ and $+0.12$, with the pressure dependence of $T_{\mathrm{c}}$ being much stronger in the latter than in the former.

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Cited by in corpus (6)

• Microscopic evidence for spin-spinless stripe order with reduced Ni moments within $ab$ plane for bilayer nickelate La${}_3$Ni${}_2$O${}_7$ probed by ${}^{139}$La-NQR
• Strong-coupling study of the pairing mechanism in pressurized La${}_3$Ni${}_2$O${}_7$
• $t$-$J$ model for strongly correlated two-orbital systems: Application to bilayer nickelate superconductors
• The electronic structure and disorder effect of La${}_3$Ni${}_2$O${}_7$ superconductor
• Theoretical study of the crystal structure of the bilayer nickel oxychloride Sr${}_3$Ni${}_2$O${}_5$Cl${}_2$ and analysis of possible unconventional superconductivity
• Damage of bilayer structure in La3Ni2O7-d induced by high pO2 annealing