Doping-insensitive density-of-states suppression in polycrystalline iron-based superconductor

2008/05/31 by H. W. Ou, Y. Zhang, Yiting Zhang +25 · 18 citations
Materials Science · Physics and Astronomy · #Angle-resolved photoemission spectroscopy #Condensed matter physics #Crystallite #Cuprate #Density of states #Doping #Electronic structure #Iron-based superconductor #Iron-based superconductors research #Materials science #Nuclear magnetic resonance #Photoemission spectroscopy #Physics #Physics of Superconductivity and Magnetism #Pseudogap #Rare-earth and actinide compounds #Spectroscopy #Superconductivity #X-ray photoelectron spectroscopy #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1016/j.ssc.2008.10.008

published in Solid State Communications 148(11-12), 504-507 (Elsevier BV) · 4 pages, 4 figures

arxiv created 2008/05/31 · openalex publication_date 2008/10/16 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We investigated the temperature dependence of the density-of-states in the iron-based superconductor SmO₁-xF_xFeAs (x=0, 0.12, 0.15, 0.2) with high resolution angle-integrated photoemission spectroscopy. The density-of-states suppression is observed with decreasing temperature in all samples, revealing two characteristic energy scales (10meV and 80meV). However, no obvious doping dependence is observed. We argue that the 10meV suppression is due to an anomalously doping-independent normal state pseudogap, which becomes the superconducting gap once in the superconducting state; and alert the possibility that the 80meV-scale suppression might be an artifact of the polycrystalline samples.

Citations

• Correlated Electronic Structure ofLaO1−xFxFeAs
• Iron-based layered compound LaFeAsO is an antiferromagnetic semimetal
• Unconventional Superconductivity with a Sign Reversal in the Order Parameter ofLaFeAsO1−xFx
• Angle-resolved photoemission studies of the cuprate superconductors
• Proximity of antiferromagnetism and superconductivity inLaFeAsO1−xFx: Effective Hamiltonian fromab initiostudies
• Evolution from Itinerant Antiferromagnet to Unconventional Superconductor with Fluorine Doping in LaFeAs(O1-xFx) Revealed by 75As and 139La Nuclear Magnetic Resonance
• Superconductivity at 43 K in SmFeAsO1-xF x
• Doping-dependent phase diagram of LaOMAs (M=V–Cu) and electron-type superconductivity near ferromagnetic instability
• Superconductivity at 52 K in iron based F doped layered quaternary compound Pr[O1–xFx]FeAs
• Transition Temperature of Strong-Coupled Superconductors
• Destruction of the Fermi surface in underdoped high-Tc superconductors