Pressure Driven Fractionalization of Ionic Spins Results in Cupratelike High-Tc Superconductivity in La3Ni2O7
Ruoshi Jiang (姜若诗), Jinning Hou (侯晋宁), Zhiyu Fan (樊知宇), Zi-Jian Lang (郎子健), Wei Ku (顧威)
DOI 10.1103/PhysRevLett.132.126503 · Physical Review Letters
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Abstract
Beyond 14 GPa of pressure, bilayered La3Ni2O7 was recently found to develop strong superconductivity above the liquid nitrogen boiling temperature. An immediate essential question is the pressure-induced qualitative change of electronic structure that enables the exciting high-temperature superconductivity. We investigate this timely question via a numerical multiscale derivation of effective many-body physics. At the atomic scale, we first clarify that the system has a strong charge transfer nature with itinerant carriers residing mainly in the in-plane oxygen between spin-1 Ni2+ ions. We then elucidate in electron-volt scale and sub-electron-volt scale the key physical effect of the applied pressure: it induces a cupratelike electronic structure via fractionalizing the Ni ionic spin from 1 to 1/2. This suggests a high-temperature superconductivity in La3Ni2O7 with microscopic mechanism and (d-wave) symmetry similar to that in the cuprates.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La3Ni2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | 14 GPa | unknown |
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