Multiband model of high Tc superconductors

Abstract

We propose an extension to other high T_{c } compounds of a model introduced earlier for YBCO. In the ''self-doped'' compounds we assume that the doping part (namely the BiO, HgO, TlO planes in BSCCO, HBCCO, TBCCO respectively) is metallic, which leads to a multiband model. This assumption is supported by band structure calculations. Taking a repulsive pairing interaction between these doping bands and the CuO_{2} bands leads to opposite signs for the order parameter on these bands and to nodes whenever the Fermi surfaces of these bands cross. We show that in BSCCO the low temperature dependence of the penetration depth is reasonably accounted for. In this case the nodes are not located near the 45^{o} direction, which makes the experimental determination of the node locations an important test for our model. The situation in HBCCO and TBCCO is rather analogous to BSCCO. We consider the indications given by NMR and find that they rather favor a metallic character for the doping bands. Finally we discuss the cases of NCCO and LSCO which are not ''self-doped'' and where our model does not give nodes.

11 pages, revtex, 1 figures

References in corpus (8)

• Ferromagnetic spin fluctuation induced superconductivity in Sr_2RuO_4
• C-axis Josephson Tunneling Between YBCO and Pb: Direct Evidence for Mixed Order Parameter Symmetry in a High-T_c Superconductor
• New features in the microwave response of YBCO crystals: Evidence for a multi-component order parameter
• Experimental Test of the Inter-Layer Pairing Models for High-Tc Superconductivity Using Grazing Incidence Infrared Reflectometry
• In-plane optical response of Bi2Sr2CuO6
• Nodes of the superconducting gap probed by electronic Raman scattering in HgBa_{2}CaCu_{2}O_{6+δ} single crystals
• Symmetry of the superconducting gap in $HgB{a}_{2}CaC{u}_2{O}_{6+\delta }$ single crystals from electronic Raman scattering
• Plane - Chain coupling in YBa_{2}Cu_{3}O_{7} : temperature dependence of the penetration depth

Cited by in corpus (4)

• Feshbach resonances and mesoscopic phase separation near a quantum critical point in multiband FeAs-based superconductors
• Disorder and chain superconductivity in YBa_2Cu_3O_{7-δ}
• "Pair" Fermi contour and repulsion-induced superconductivity in cuprates
• Magnetic correlations on the full chains of Ortho-II YBa${}_2$Cu${}_3$O${}_{6.5}$