Effect of CuO2 Lattice Strain on the Electronic Structure and Properties of High-Tc Cuprate Family

Abstract

Doping and strain dependences of the electronic structure of the CuO 6 -octahedra layer within LDA+GTB method in the frameworks of six-band p-d model are calculated. Band structure and Fermi surface of the quasiparticle excitations in the effective Hubbard model are characterized by inhomogeneous distribution of the k-dependent spectral weight. Doping results in reconstruction of the band structure, redistribution of the spectral weight over dispersion surface and reconstruction of Fermi surface from small hole pockets in the underdoped region to large hole contour in the overdoped region through two quantum phase transitions (QPT). Strain increasing leads to displacement of the valence and conductivity bands, bandwidths decreasing and shift of the concentrations corresponding to QPTs. Strain dependences of the antiferromagnetic exchange coupling and DOS at the Fermi level determining superconducting temperature T c are obtained. Effective exchange coupling in the equation for T c demonstrates monotonic strain dependence.

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

“…Multiorbital models are currently used for diborides, doped fullerene and pressurized hydrides. It is now clear for that the inclusion of lattice instabilities of perovskites [118] and the anisotropic strain [119] is needed to understand the anisotropic multi gap superconductivity in strongly correlated systems. Moreover, today there is a high interest on electron-phonon interaction [43,95] and on lattice heterogeneity as proposed by Alex [120].…”

Room temperature superconductivity dome at a Fano resonance in superlattices of wires

“…-The correlated disorder in quantum complex matter has been unveiled in these last two decades by novel imaging methods using nanoscale X-ray diffraction [24][25][26][27][28] and XANES or EXAFS methods of X-ray spectroscopy probing local and fast fluctuations [29,30] showing the formation of puddles of superlattices of quantum stripes [19]. Nanoscale inhomogeneity is controlled in hole-doped cuprate perovskites [20,[31][32][33][34][35][36]. The critical temperature at ambient pressure is controlled by both misfit strain ( ) between nanoscale modules and hole doping δ giving the 3D phase diagram T C (δ, ), which is shown in fig.…”