Origins of large critical temperature variations in single layer cuprates

Abstract

We study the electronic structures of two single layer superconducting cuprates, Tl${}_2$Ba${}_2$CuO${}_{6+\delta }$ (Tl2201) and (Bi${}_{1.35}$Pb${}_{0.85}$)(Sr${}_{1.47}$La${}_{0.38}$)CuO${}_{6+\delta }$ (Bi2201) which have very different maximum critical temperatures (90K and 35K respectively) using Angular Resolved Photoemission Spectroscopy (ARPES). We are able to identify two main differences in their electronic properties. First, the shadow band that is present in double layer and low T${}_{c,max}$ single layer cuprates is absent in Tl2201. Recent studies have linked the shadow band to structural distortions in the lattice and the absence of these in Tl2201 may be a contributing factor in its T${}_{c,max}$.Second, Tl2201's Fermi surface (FS) contains long straight parallel regions near the anti-node, while in Bi2201 the anti-nodal region is much more rounded. Since the size of the superconducting gap is largest in the anti-nodal region, differences in the band dispersion at the anti-node may play a significant role in the pairing and therefore affect the maximum transition temperature.

6 pages, 5 figures,1 table

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Cited by in corpus (8)

• Collapse of the Fermi surface and fingerprints of order in the pseudogap state of cuprate superconductors
• A Theory for the High-T_c Cuprates: Anomalous Normal-State and Spectroscopic Properties, Phase Diagram, and Pairing
• Angle-resolved photoemission spectroscopy study of HgBa${}_2$CuO${}_{4+\delta }$
• Gutzwiller Magnetic Phase Diagram of the Cuprates
• Damped spin excitations in a doped cuprate superconductor with orbital hybridization
• Doping-dependent energy scale of the low-energy band renormalization in (Bi,Pb)2(Sr,La)2CuO6+d
• Disparity of superconducting and pseudogap scales in low-Tc Bi-2201 cuprates
• Influence of oxygen-coordination number on the electronic structure of single-layer La-based cuprates