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Evolution of symmetry and structure of the gap in iron-based superconductors with doping and interactions

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [3];  [4];  [1]
  1. University of Wisconsin, Madison, WI (United States)
  2. University of Florida, Gainesville, FL (United States); Siberian Branch of Russian Academy of Sciences, Krasnoyarsk (Russia); Siberian Federal University, Krasnoyarsk (Russia)
  3. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  4. University of Florida, Gainesville, FL (United States)
+ Show Author Affiliations
We present a detailed study of the symmetry and structure of the pairing gap in Fe-based superconductors (FeSCs). We treat FeSCs as quasi-2D, decompose the pairing interaction in the XY plane in s-wave and d-wave channels into contributions from scattering between different Fermi surfaces, and analyze how each scattering evolves with doping and input parameters. We verify that each interaction is well approximated by the lowest angular harmonics. We use this simplification to analyze the interplay between the interaction with and without spin-fluctuation components, the origin of the attraction in the s± and dx2–y2 channels, the competition between them, the angular dependence of the s± gaps along the electron Fermi surface, the conditions under which the s± gap develops nodes, and the origin of superconductivity in heavily electron- or hole-doped systems, when only Fermi surfaces of one type are present. We also discuss the relation between RPA and RG approaches for FeSCs.
Research Organization:
University of Florida, Gainesville, FL (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-05ER46236
OSTI ID:
2484137
Alternate ID(s):
OSTI ID: 1098412
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 22 Vol. 84; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (47)

Renormalization group analysis of competing orders and the pairing symmetry in Fe-based superconductors journal May 2009
Strength of correlations in electron- and hole-doped cuprates journal June 2010
Gap symmetry and structure of Fe-based superconductors journal October 2011
Quantum criticality in the iron pnictides and chalcogenides journal May 2011
Near-degeneracy of several pairing channels in multiorbital models for the Fe pnictides journal February 2009
Correlation effects in the iron pnictides journal April 2009
Pairing in the iron arsenides: a functional RG treatment journal May 2009
Sensitivity of the superconducting state and magnetic susceptibility to key aspects of electronic structure in ferropnictides journal July 2010
Proximity of antiferromagnetism and superconductivity in LaFeAsO 1 − x F x : Effective Hamiltonian from ab initio studies journal June 2008
Magnetism, superconductivity, and pairing symmetry in iron-based superconductors journal October 2008
Possible pairing states of the Fe-based superconductors journal October 2008
Experimental consequences of thes-wavecos(kx)cos(ky)superconductivity in the iron pnictides journal October 2008
Nodal spin density wave and band topology of the FeAs-based materials journal January 2009
Properties of a two-orbital model for oxypnictide superconductors: Magnetic order, B 2 g spin-singlet pairing channel, and its nodal structure journal April 2009
Origin of gap anisotropy in spin fluctuation models of the iron pnictides journal June 2009
Pnictogen height as a possible switch between high- T c nodeless and low- T c nodal pairings in the iron-based superconductors journal June 2009
Valley density-wave and multiband superconductivity in iron-based pnictide superconductors journal July 2009
Tight-binding model for iron pnictides journal September 2009
Momentum dependence and nodes of the superconducting gap in the iron pnictides journal October 2009
Functional renormalization-group study of the doping dependence of pairing symmetry in the iron pnictide superconductors journal November 2009
Phase diagram and gap anisotropy in iron-pnictide superconductors journal February 2010
Nodes in the gap function of LaFePO, the gap function of the Fe(Se,Te) systems, and the STM signature of the s ± pairing journal May 2010
Spin fluctuations and superconductivity in a three-dimensional tight-binding model for BaFe 2 As 2 journal June 2010
Evidence for superconducting gap nodes in the zone-centered hole bands of KFe 2 As 2 from magnetic penetration-depth measurements journal July 2010
Superconductivity in the iron selenide K x Fe 2 Se 2 ( 0 ≤ x ≤ 1.0 ) journal November 2010
Renormalization group flow, competing phases, and the structure of superconducting gap in multiband models of iron-based superconductors journal December 2010
d -wave pairing from spin fluctuations in the K x Fe 2 − y Se 2 superconductors journal March 2011
Emergence of fully gapped s + + -wave and nodal d -wave states mediated by orbital and spin fluctuations in a ten-orbital model of KFe 2 Se 2 journal April 2011
Stripes, spin resonance, and nodeless d -wave pairing symmetry in Fe 2 Se 2 -based layered superconductors journal July 2011
Symmetry analysis of possible superconducting states in K x Fe y Se 2 superconductors journal July 2011
Modulated superconductivity due to vacancy and magnetic order in A y Fe 2 − x / 2 Se 2 [ A = Cs , K, (Tl,Rb), (Tl,K)] iron-selenide superconductors journal September 2011
Spin fluctuations and unconventional pairing in KFe 2 As 2 journal October 2011
Density Functional Study of LaFeAsO 1 − x F x : A Low Carrier Density Superconductor Near Itinerant Magnetism journal June 2008
Unconventional Pairing Originating from the Disconnected Fermi Surfaces of Superconducting LaFeAsO 1 − x F x journal August 2008
Model for the Magnetic Order and Pairing Channels in Fe Pnictide Superconductors journal December 2008
Fermi-Surface Shrinking and Interband Coupling in Iron-Based Pnictides journal July 2009
Band Structure and Fermi Surface of an Extremely Overdoped Iron-Based Superconductor KFe 2 As 2 journal July 2009
Quantum Criticality and Nodal Superconductivity in the FeAs-Based Superconductor KFe 2 As 2 journal February 2010
Orbital-Fluctuation-Mediated Superconductivity in Iron Pnictides: Analysis of the Five-Orbital Hubbard-Holstein Model journal April 2010
Incommensurate Spin Fluctuations in Hole-Overdoped Superconductor KFe 2 As 2 journal February 2011
Absence of a Holelike Fermi Surface for the Iron-Based K 0.8 Fe 1.7 Se 2 Superconductor Revealed by Angle-Resolved Photoemission Spectroscopy journal May 2011
Mechanism for Explaining Differences in the Order Parameters of FeAs-Based and FeP-Based Pnictide Superconductors journal May 2011
Exotic d -Wave Superconducting State of Strongly Hole-Doped K x Ba 1 − x Fe 2 As 2 journal September 2011
Evolution of the Superconducting State of Fe-Based Compounds with Doping journal September 2011
Robustness of s -Wave Pairing in Electron-Overdoped A 1 − y Fe 2 − x Se 2 ( A = K , ​ Cs ) journal September 2011
Fermi Surface and Mass Enhancement in KFe 2 As 2 from de Haas–van Alphen Effect Measurements journal May 2010
The electron pairing of K x Fe 2− y Se 2 journal February 2011

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY