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 d-orbital degree of freedom. This fact means that the fully gapped sign-reversing s-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 Tc, 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.
| Original language | English |
|---|---|
| Article number | 177001 |
| Journal | Physical Review Letters |
| Volume | 103 |
| Issue number | 17 |
| DOIs | |
| Publication status | Published - Oct 21 2009 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Violation of anderson's theorem for the sign-reversing s-wave state of iron-pnictide superconductors. / Onari, Seiichiro; Kontani, Hiroshi.
In: Physical Review Letters, Vol. 103, No. 17, 177001, 21.10.2009.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Violation of anderson's theorem for the sign-reversing s-wave state of iron-pnictide superconductors
AU - Onari, Seiichiro
AU - Kontani, Hiroshi
PY - 2009/10/21
Y1 - 2009/10/21
N2 - 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 d-orbital degree of freedom. This fact means that the fully gapped sign-reversing s-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 Tc, 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.
AB - 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 d-orbital degree of freedom. This fact means that the fully gapped sign-reversing s-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 Tc, 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.
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U2 - 10.1103/PhysRevLett.103.177001
DO - 10.1103/PhysRevLett.103.177001
M3 - Article
VL - 103
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 17
M1 - 177001
ER -