Why the critical temperature of high-Tc cuprate superconductors is so low: The importance of the dynamical vertex structure
Motoharu Kitatani, Thomas Schäfer, Hideo Aoki, Karsten Held
DOI 10.1103/PhysRevB.99.041115 · Physical Review B
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Abstract
To fathom the mechanism of high-temperature (Tc) superconductivity, the dynamical vertex approximation is evoked for the two-dimensional repulsive Hubbard model. After showing that our results reproduce well the cuprate phase diagram with a reasonable Tc and dome structure, we keep track of the scattering processes that primarily affect Tc. We find that local particle-particle diagrams significantly screen the bare interaction at low frequencies, which in turn suppresses antiferromagnetic spin fluctuations and hence the pairing interaction. Thus we identify dynamical vertex corrections as one of the main oppressors of Tc, which may provide a hint toward higher Tc's.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | onset |
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