Origins of large critical temperature variations in single-layer cuprates

TitleOrigins of large critical temperature variations in single-layer cuprates
Publication TypeJournal Article
Year of Publication2008
AuthorsPalczewski AD, Kondo T, Khasanov R, Kolesnikov NN, Timonina AV, Rotenberg E, Ohta T, Bendounan A, Sassa Y, Fedorov A, Pailhes S, Santander-Syro AF, Chang J, Shi M, Mesot J, Fretwell HM, Kaminski A
Journal TitlePhysical Review B
Date PublishedAug
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000259368200127
Keywordsanisotropy, bi2sr2cacu2o8, CA2-XNAXCUO2CL2, CRYSTALS, fermi-surface, superconducting gap, TC, TL2BA2CUO6

We study the electronic structures of two single-layer superconducting cuprates, Tl2Ba2CuO6+delta (T12201) and (Bi1.35Pb0.85) (Sr1.47La0.38) CuO6+delta (Bi2201) which have very different maximum critical temperatures (90 K and 35 K, 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,T-max single-layer cuprates is absent in T12201. Recent studies have linked the shadow band to structural distortions in the lattice and the absence of these in T12201 may be a contributing factor in its T-c,T-max Second, T12201's Fermi surface (FS) contains long straight parallel regions near the antinode, while in Bi2201 the antinodal region is much more rounded. Since the size of the superconducting gap is largest in the antinodal region, differences in the band dispersion at the antinode may play a significant role in the pairing and therefore affect the maximum transition temperature.

Alternate JournalPhys. Rev. B