Violation of Anderson’s Theorem for the Sign-Reversing-Wave State of Iron-Pnictide Superconductors
- 21 October 2009
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 103 (17), 177001
- https://doi.org/10.1103/physrevlett.103.177001
Abstract
Based on the five-orbital model, we study the effect of local impurity in iron pnictides, and find that the interband impurity scattering is promoted by the -orbital degree of freedom. This fact means that the fully gapped sign-reversing -wave state, which is predicted by spin fluctuation theories, is very fragile against impurities. In the BCS theory, only 1% impurities with intermediate strength induce huge pair breaking, resulting in the large in-gap state and prominent reduction in , contrary to the prediction based on simple orbital-less models. The present study provides a stringent constraint on the pairing symmetry and the electronic states in iron pnictides.
Other Versions
This publication has 32 references indexed in Scilit:
- Studies on Superconducting LaFe1-yCoyAsO1-xFx(x=0.11) –For the Understanding of the Superconducting Symmetry of Fe-Pnictides–Journal of the Physics Society Japan, 2009
- Microwave Surface-Impedance Measurements of the Magnetic Penetration Depth in Single CrystalSuperconductors: Evidence for a Disorder-Dependent Superfluid DensityPhysical Review Letters, 2009
- Momentum-resolved superconducting gap in the bulk of Ba1−xKxFe2As2from combined ARPES and μSR measurementsNew Journal of Physics, 2009
- Distinct Transport Behaviors of LaFe1-yCoyAsO1-xFx (x=0.11) between the Superconducting and Nonsuperconducting Metallic y Regions Divided by y ∼0.05Journal of the Physics Society Japan, 2009
- Superconducting gap symmetry of Ba 0.6 K 0.4 Fe 2 As 2 studied by angle-resolved photoemission spectroscopyEurophysics Letters, 2009
- Microwave Penetration Depth and Quasiparticle Conductivity ofSingle Crystals: Evidence for a Full-Gap SuperconductorPhysical Review Letters, 2009
- Superconductivity of LaFe1-yCoyAsO1-xFxJournal of the Physics Society Japan, 2008
- Spin-singlet superconductivity with multiple gaps in PrFeAsO 0.89 F 0.11Europhysics Letters, 2008
- NMR Studies of SuperconductingPhysical Review Letters, 2008
- Iron-Based Layered Superconductor La[O1-xFx]FeAs (x = 0.05−0.12) with Tc = 26 KJournal of the American Chemical Society, 2008