Doping-dependent nodal Fermi velocity in Bi-2212 revealed by high-resolution ARPES

2010/02/28 by I. M. Vishik, W. S. Lee, F. Schmitt +8 · 1 citation
Physics and Astronomy · #cond-mat.supr-con #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.104.207002

published as Phys. Rev. Lett. 104 207002 (2010) · Submitted to Phys. Rev. Lett

arxiv created 2010/03/22 · arxiv updated 2015/03/13

Abstract

The improved resolution of laser-based angle-resolved photoemission spectroscopy (ARPES) allows reliable access to fine structures in the spectrum. We present a systematic, doping-dependent study of a recently discovered low-energy kink in the nodal dispersion of Bi2Sr2CaCu2O8+d (Bi-2212), which demonstrates the ubiquity and robustness of this kink in underdoped Bi-2212. The renormalization of the nodal velocity due to this kink becomes stronger with underdoping, revealing that the nodal Fermi velocity is non-universal, in contrast to assumed phenomenology. This is used together with laser-ARPES measurements of the gap velocity, v2, to resolve discrepancies with thermal conductivity measurements.

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