Non-monotonic dependence of $T_c$ on the c axis compression in the HTSC cuprate La${}_{2-x}$Sr${}_x$CuO${}_4$

Abstract

The effect of the the $c$ axis compression on the electronic structure and superconducting properties of the HTSC cuprate La${}_{2-x}$Sr${}_x$CuO${}_4$ at different doping 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 builded on the Hubbard operators. The superconducting gap and $T_c$ are calculated taking into account the exchange pairing mechanism involving not only the Zhang-Rice singlet but also excited two-hole triplet and singlet states. The energy of the $a_{1g}$ orbitals increases with increasing compression and the $a_{1g}$ quasiparticle bands begin to strongly interact with the $b_{1g}$ bands at the top of the valence band. The reconstruction of the region of states determining the superconducting properties results in the high density of states near the Fermi level. This mechanism leads to an increase in $T_c$ in the underdoped region with increasing compression. The pairing constants renormalizations under compression results in $T_c$ decreasing. The competition of these two effects leads to non-monotonic behavior of $T_c$ under the $c$-axis compression near optimal doping.

arXiv comment17 pages, 9 figures

References in corpus (20)

• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• Conventional superconductivity at 203 K at high pressures
• Superconductivity at 250 K in lanthanum hydride under high pressures
• Evidence for superconductivity above 260 K in lanthanum superhydride at megabar pressures
• Superconductive "sodalite"-like clathrate calcium hydride at high pressures
• Crystal Structure of 200 K-Superconducting Phase of Sulfur Hydride System
• The spectral weight of the Hubbard model through cluster perturbation theory
• Pressure-induced decomposition of solid hydrogen sulfide
• Superconductivity at 253 K in lanthanum-yttrium ternary hydrides
• Cluster Perturbation Theory for Hubbard models
• A new hybrid LDA and Generalized Tight-Binding method for the electronic structure calculations of strongly correlated electron systems
• Strong-Coupling Expansion for the Hubbard Model
• Doping-dependent evolution of low-energy excitations and quantum phase transitions within effective model for High-Tc copper oxides
• High pressure effects in fluorinated HgBa2Ca2Cu3O(8+d)
• Exchange and spin-fluctuation superconducting pairing in cuprates
• Role of two-dimensional electronic state in superconductivity in La${}_{2-x}$Sr${}_x$CuO${}_4$
• Interplay among critical temperature, hole content, and pressure in the cuprate superconductors
• Doping and temperature evolution of pseudogap and spin-spin correlations in the two-dimensional Hubbard model
• Effect of CuO2 lattice strain on the electronic structure and properties of high-Tc cuprate family
• The enhanced s*-wave component of the superconducting gap in the overdoped HTSC cuprates with orthorhombic distortion