Surface-enhanced charge-density-wave instability in underdoped Bi2201
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 YBCO. 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 Bi2201, which is directly associated with an hitherto-undetected strong temperature dependence of the incommensurate superstructure periodicity below 130K. 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.
Cite
@article{arxiv.1111.2673,
title = {Surface-enhanced charge-density-wave instability in underdoped Bi2201},
author = {J. A. Rosen and R. Comin and G. Levy and D. Fournier and Z. -H. Zhu and B. Ludbrook and C. N. Veenstra and A. Nicolaou and D. Wong and P. Dosanjh and Y. Yoshida and H. Eisaki and G. R. Blake and F. White and T. T. M. Palstra and R. Sutarto and F. He and A. Frano and Y. Lu and B. Keimer and G. A. Sawatzky and L. Petaccia and A. Damascelli},
journal= {arXiv preprint arXiv:1111.2673},
year = {2014}
}
Comments
A high-resolution version with supplementary material can be found at http://www.physics.ubc.ca/~quantmat/ARPES/PUBLICATIONS/Articles/Bi2201_PG_Q2.pdf