Possible high-Tc superconductivity due to incipient narrow bands originating from hidden ladders in Ruddlesden-Popper compounds
Daisuke Ogura, Hideo Aoki, Kazuhiko Kuroki
DOI 10.1103/PhysRevB.96.184513 · Physical Review B
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Abstract
We introduce the concept of “hidden ladders” for the bilayer Ruddlesden-Popper-type compounds: While the crystal structure is bilayer, dxz (dyz) orbitals in the relevant t2g sector of the transition metal form a two-leg ladder along x (y) since the dxz (dyz) electrons primarily hop in the leg (x,y) direction along with the rung (z) direction. This leads us to propose that Sr3Mo2O7 and Sr3Cr2O7 are candidates for the hidden-ladder material, with the correct position of EF from a first-principles band calculation. Based on the analysis of Eliashberg equation, we predict the possible occurrence of high-temperature superconductivity in these noncopper materials arising from the interband pair-scattering processes between a wide band and an “incipient” narrow band on the ladder.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr3Mo2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Sr3Cr2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| (Sr,Ca)14Cu24O41 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | unknown |
| HgBa2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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