Surface-enhanced CDW in underdoped Bi(2201)-cuprates

Using ARPES at low photon energy we have discovered a temperature-dependent evolution of the CuO2 plane band dispersion in underdoped Bi2Sr2-xLaxCuO6+δ (Bi2201). This effect is limited to the surface and point to a surface-enhanced CDW instability.

  Rosen, Comin et al., Nat. Commun. 4, 1977 (2013).

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Angle-resolved photoemission spectroscopy at low photon energy reveals a temperature-dependent evolution of the CuO2 plane band dispersion and apparent Fermi surface pockets in underdoped Bi2Sr2-xLaxCuO6+δ (Bi2201), which is directly associated with an hitherto-undetected evolution of the incommensurate superstructure periodicity below 130K. Surprisingly, this effect is limited to the surface (ARPES-LEED), with no corresponding temperature evolution in the bulk (XRD-REXS). These findings point to a surface-enhanced incipient charge-density-wave instability, driven by Fermi surface nesting. This discovery is of critical importance in the interpretation of single-particle spectroscopy data, and establishes the surface of cuprates and other complex oxides as a rich playground for the study of electronically soft phases.
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Surface-enhanced charge-density-wave instability in underdoped Bi2Sr2-xLaxCuO6+δ
J.A. Rosen, R. Comin, G. Levy, D. Fournier, Z.-H. Zhu, B. Ludbrook, C.N. Veenstra, A. Nicolaou, D. Wong, P. Dosanjh, Y. Yoshida, H. Eisaki, G.R. Blake, F. White, T.T.M. Palstra, R. Sutarto, F. He, A. Fraño Pereira, Y. Lu, B. Keimer, G. Sawatzky, L. Petaccia, A. Damascelli,
Nat. Commun. 4, 1977 (2013).
doi: 10.1038/ncomms2977

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