Nonmonotonic dependence of Tc on the c-axis compression in the high-temperature superconducting cuprate La2−xSrxCuO4
I. A. Makarov, S. G. Ovchinnikov
DOI 10.1103/bkc6-7ggv · Physical Review B
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Abstract
The effect of c-axis compression on the electronic structure and superconducting (SC) properties of the high-temperature SC cuprate La2−xSrxCuO4 at different doping levels is investigated. The electronic structure of quasiparticle excitations is obtained within the effective five-band Hubbard model, using the equation of motion method for Green's functions based on Hubbard operators. The SC gap and Tc are calculated by considering the exchange pairing mechanism, which involves not only the Zhang-Rice singlet but also excited two-hole triplet and singlet states. The energy of the a1g orbitals increases with increasing compression, and the a1g quasiparticle bands begin to strongly interact with the b1g bands at the top of the valence band. The reconstruction of the region of states that determine the SC properties results in a high density of states near the Fermi level. This mechanism leads to an increase in Tc in the underdoped region with increasing compression. On the other hand, the renormalization of the pairing constants under compression results in a decrease in Tc. The competition between these two effects leads to the nonmonotonic behavior of Tc under c-axis compression near optimal doping.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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