Surface-enhanced charge-density-wave instability in underdoped Bi2Sr2-xLaxCuO6+δ

Rosen, J. A.; Comin, R.; Levy, G.; Fournier, D.; Zhu, Z. H.; Ludbrook, B.; Veenstra, C. N.; Nicolaou, A.; Wong, D.; Dosanjh, P.; Yoshida, Y.; Eisaki, H.; Blake, G. R.; White, F.; Palstra, T. T. M.; Sutarto, R.; He, F.; Pereira, A. F.; Lu, Y.; Keimer, B.; Sawatzky, G.; Petaccia, L.; Damascelli, A.

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Surface-enhanced charge-density-wave instability in underdoped Bi₂Sr_2-xLa_xCuO_6+δ

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Keimer, B.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Damascelli, A.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Rosen, J. A., Comin, R., Levy, G., Fournier, D., Zhu, Z. H., Ludbrook, B., et al. (2013). Surface-enhanced charge-density-wave instability in underdoped Bi₂Sr_2-xLa_xCuO_6+δ. Nature Communications, 4: 1977.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C76D-8

Abstract

Neutron and X-ray scattering experiments have provided mounting evidence for spin and charge ordering phenomena in underdoped cuprates. These range from early work on stripe correlations in Nd-LSCO to the latest discovery of charge-density-waves in YBa2Cu3O6 + x. Both phenomena are characterized by a pronounced dependence on doping, temperature and an externally applied magnetic field. Here, we show that these electron-lattice instabilities exhibit also a previously unrecognized bulk-surface dichotomy. Surface-sensitive electronic and structural probes uncover a temperature-dependent evolution of the CuO2 plane band dispersion and apparent Fermi pockets in underdoped Bi-2 Sr2-x La-x CuO6 + delta (Bi2201), which is directly associated with an hitherto-undetected strong temperature dependence of the incommensurate superstructure periodicity below 130 K. In stark contrast, the structural modulation revealed by bulk-sensitive probes is temperature-independent. 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.