Robust accidental nodes and zeros and critical quasiparticle scaling in iron-based multiband superconductors.

Journal Article · Tue Jul 19 00:00:00 EDT 2011 · Phys. Rev. B

DOI:https://doi.org/10.1103/PhysRevB.84.014505· OSTI ID:1022439

Stanev, V; Alexandrov, B S; Nikolic, P; Tesanovic, Z ^[1]

---

1. Materials Science Division

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 T{sub c} - 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.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 1022439
• Report Number(s): ANL/MSD/JA-70655; TRN: US201117%%595
• Journal Information: Phys. Rev. B, Vol. 84, Issue 1 ; Jul. 19, 2011
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
PHASE DIAGRAMS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMODYNAMICS
TRANSPORT