Origins of large critical temperature variations in single-layer cuprates

Journal Article · Tue Aug 26 04:00:00 EDT 2008 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.78.054523· OSTI ID:963280

Palczewski, A D; Kondo, T; Khasanov, R; Kolesikov, N N; Timonina,; Rotenberg, E; Ohta, T; Bendounan, A; Sassa, Y; Fedorov, A; Paihes, S; Santander-Syro, A F; Chang, J; Shi, M; Mesot, J; Fretwell, H M; Kaminski, A

We study the electronic structures of two single-layer superconducting cuprates, Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} (Tl2201) and (Bi{sub 1.35}Pb{sub 0.85}) (Sr{sub 1.47}La{sub 0.38}) CuO{sub 6+{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{sub 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{sub c,max}. Second, Tl2201'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.

• Research Organization: Ames Laboratory (AMES), Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-07CH11358
• OSTI ID: 963280
• Report Number(s): IS-J 7315
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 5 Vol. 78; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL TEMPERATURE
CUPRATES
ELECTRONIC STRUCTURE
FERMI LEVEL
PHOTOEMISSION
SPECTROSCOPY
TRANSITION TEMPERATURE