Chiral Plaquette Polaron Theory of Cuprate Superconductivity
| dc.creator | Tahir-Kheli, Jamil | |
| dc.creator | Goddard III, William A. | |
| dc.date | 2007-07-23 | |
| dc.date.accessioned | 2026-07-07T08:19:54Z | |
| dc.date.available | 2026-07-07T08:19:54Z | |
| dc.description | Ab-initio density functional calculations on explicitly doped La(2-x)Sr(x)CuO4 find doping creates localized holes in out-of-plane orbitals. A model for superconductivity is developed based on the assumption that doping leads to the formation of holes on a four-site Cu plaquette composed of the out-of-plane A1 orbitals apical O pz, planar Cu dz2, and planar O psigma. This is in contrast to the assumption of hole doping into planar Cu dx2-y2 and O psigma orbitals as in the t-J model. Interaction of holes with the d9 spin background leads to chiral polarons with either a clockwise or anti-clockwise charge current. When the polaron plaquettes percolate through the crystal at x~0.05 for LaSrCuO, a Cu dx2-y2 and planar O psigma band is formed. Spin exchange Coulomb repulsion with chiral polarons leads to D-wave superconductivity. The equivalent of the Debye energy in phonon superconductivity is the maximum energy separation between a chiral polaron and its time-reversed partner. An additive skew-scattering contribution to the Hall effect is induced by chiral polarons and leads to a temperature dependent Hall effect that fits the measured values for LaSrCuO. The integrated imaginary susceptibility satisfies omega/T scaling due to chirality and spin-flip scattering of polarons along with a uniform distribution of polaron energy splittings. The derived functional form is compatible with experiments. The static spin structure factor is computed and is incommensurate with a separation distance from (pi,pi) given by ~(2pi)x. Coulomb scattering of the x2-y2 band with polarons leads to linear resistivity. Coupling of the x2-y2 band to the undoped Cu d9 spins leads to the ARPES pseudogap and its doping and temperature dependence. | |
| dc.description | 32 pages, 17 figures | |
| dc.identifier | https://arxiv.org/abs/0707.3535 | |
| dc.identifier | http://arxiv.org/abs/0707.3535 | |
| dc.identifier | Phys. Rev. B vol. 76, 014514 (2007) | |
| dc.identifier | doi:10.1103/PhysRevB.76.014514 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/134925 | |
| dc.subject | Superconductivity | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Chiral Plaquette Polaron Theory of Cuprate Superconductivity | |
| dc.type | text |