skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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.

Authors:
; ; ;  [1];  [2];  [2];  [2]
  1. (Materials Science Division)
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1022439
Report Number(s):
ANL/MSD/JA-70655
Journal ID: 1098-0121; TRN: US201117%%595
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Phys. Rev. B
Additional Journal Information:
Journal Volume: 84; Journal Issue: 1 ; Jul. 19, 2011
Country of Publication:
United States
Language:
ENGLISH
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; PHASE DIAGRAMS; SUPERCONDUCTIVITY; SUPERCONDUCTORS; THERMODYNAMICS; TRANSPORT

Citation Formats

Stanev, V., Alexandrov, B. S., Nikolic, P., Tesanovic, Z., Los Alamos Nat. Lab.), George Mason Univ.), and Johns Hopkins Univ.). Robust accidental nodes and zeros and critical quasiparticle scaling in iron-based multiband superconductors.. United States: N. p., 2011. Web. doi:10.1103/PhysRevB.84.014505.
Stanev, V., Alexandrov, B. S., Nikolic, P., Tesanovic, Z., Los Alamos Nat. Lab.), George Mason Univ.), & Johns Hopkins Univ.). Robust accidental nodes and zeros and critical quasiparticle scaling in iron-based multiband superconductors.. United States. doi:10.1103/PhysRevB.84.014505.
Stanev, V., Alexandrov, B. S., Nikolic, P., Tesanovic, Z., Los Alamos Nat. Lab.), George Mason Univ.), and Johns Hopkins Univ.). Tue . "Robust accidental nodes and zeros and critical quasiparticle scaling in iron-based multiband superconductors.". United States. doi:10.1103/PhysRevB.84.014505.
@article{osti_1022439,
title = {Robust accidental nodes and zeros and critical quasiparticle scaling in iron-based multiband superconductors.},
author = {Stanev, V. and Alexandrov, B. S. and Nikolic, P. and Tesanovic, Z. and Los Alamos Nat. Lab.) and George Mason Univ.) and Johns Hopkins Univ.)},
abstractNote = {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.},
doi = {10.1103/PhysRevB.84.014505},
journal = {Phys. Rev. B},
number = 1 ; Jul. 19, 2011,
volume = 84,
place = {United States},
year = {2011},
month = {7}
}