Lattice source for charge and spin inhomogeneity in 2D perovskite cuprates

Abstract

In the work we highlight the structural features of 2D perovskite cuprates (tilted CuO${}_6$ octahedra with different orientation with respect to spacer rocksalt layers), where sources of charge and spin inhomogeneity can be hidden. We used the impurity Anderson model with the Jahn-Teller(JT) local cells to show the charge inhomogeneity arises at any low doping concentration $x$, but disappears when the doping level exceeds threshold concentration $x_c$, and the lower the magnitudes $x_c$, the more JT region square. It is expected that spontaneous chiral symmetry breaking in the dynamic JT state of the stripe CuO${}_2$ layer as a whole can lead to the appearance of the goldstone phonon mode. As consequence, the giant thermal Hall effect could be observed in the 2D perovskite cuprates with CuO${}_6$ octahedra, rather than with CuO${}_4$ squares, e.g. in Tl-based $n$ layer cuprates or cuprates based on the infinite-layer CaCuO${}_2$ structure.