2010/06/30 by Valentin Stanev, Boian S. Alexandrov, Predrag Nikolić +3
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Corporate Taxation and Avoidance #Iron-based superconductors research #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.84.014505
published as Phys. Rev. B 84, 014505 (2011) · 7 pages, 8 figures, A typo corrected
arxiv created 2011/05/19 · openalex publication_date 2011/07/19 · arxiv updated 2011/08/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study multigap superconductivity, with strong angular variations of one of the gaps, as appropriate for certain iron-based high-temperature superconductors. We solve the gap equations of this model and find that the nodes or zeros in the gap function present at Tc---although purely accidental---typically survive down to T=0. Based on this result, we investigate the line of quantum transitions at which gap zeros first appear. The peculiar ``zero-point'' quantum critical scaling emanating from this line dominates quasiparticle thermodynamics and transport properties over much of the phase diagram and supplants more familiar forms of scaling associated with the accidental nodes.