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Phys. Rev. B 78, 054523 (2008) [5 pages]

Origins of large critical temperature variations in single-layer cuprates

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A. D. Palczewski1, T. Kondo1, R. Khasanov2, N. N. Kolesnikov3, A. V. Timonina3, E. Rotenberg4, T. Ohta4, A. Bendounan5, Y. Sassa5, A. Fedorov4, S. Pailhés5, A. F. Santander-Syro6,7, J. Chang5, M. Shi8, J. Mesot5, H. M. Fretwell1, and A. Kaminski1
1Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
2Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
3Institute of Solid State Physics, Chernogolovka, 142432 Russia
4Advanced Light Source, Berkeley National Laboratory, Berkeley, California 94720, USA
5Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
6Laboratoire Photons Et Matière, UPR-5 CNRS, ESPCI, 10 rue Vauquelin, 75231 Paris Cedex 5, France
7Laboratoire de Physique des Solides, UMR-8502 CNRS, Université Paris-Sud 11, Bâtiment 510, 91405 Orsay, France
8Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

Received 23 June 2008; revised 10 July 2008; published 26 August 2008

We study the electronic structures of two single-layer superconducting cuprates, Tl2Ba2CuO6+δ (Tl2201) and (Bi1.35Pb0.85) (Sr1.47La0.38) CuO6+δ (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 Tc,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 Tc,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.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.054523
DOI:
10.1103/PhysRevB.78.054523
PACS:
74.25.Jb, 74.72.Hs, 74.72.Jt, 79.60.Bm
 
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