Abstract
We present a microscopic study of the nuclear magnetic relaxation rate 1/T 1 based on the five-orbital model for iron-based superconductors. We mainly discuss the effect of the inelastic quasi-particle damping rate γ due to many-body interaction on the size of the coherence peak, for both s ++ and s ±-wave superconducting states. We focus on Ba(Fe 1xCo x) 2As 2, and systematically evaluate γ in the normal state from the experimental resistivity, from optimally to overdoped compounds. Next, γ in the superconducting state is calculated microscopically based on second-order perturbation theory. In optimally doped compounds (T c30K), it is revealed that the coherence peak on 1/T 1T is completely suppressed due to large γ for both s ++ and s ±-wave states. On the other hand, in heavily overdoped compounds with T cc is quickly suppressed in proportion to . By making careful comparison between theoretical and experimental results, we conclude that it is difficult to discriminate between s ++ and s ±-wave states from the present experimental results.
| Original language | English |
|---|---|
| Article number | 084006 |
| Journal | Superconductor Science and Technology |
| Volume | 25 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Aug 2012 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics
- Ceramics and Composites
- Materials Chemistry
- Metals and Alloys
Cite this
Effect of inelastic scattering on the nuclear magnetic relaxation rate 1/T 1T in iron-based superconductors. / Yamakawa, Youichi; Onari, Seiichiro; Kontani, Hiroshi.
In: Superconductor Science and Technology, Vol. 25, No. 8, 084006, 08.2012.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of inelastic scattering on the nuclear magnetic relaxation rate 1/T 1T in iron-based superconductors
AU - Yamakawa, Youichi
AU - Onari, Seiichiro
AU - Kontani, Hiroshi
PY - 2012/8
Y1 - 2012/8
N2 - We present a microscopic study of the nuclear magnetic relaxation rate 1/T 1 based on the five-orbital model for iron-based superconductors. We mainly discuss the effect of the inelastic quasi-particle damping rate γ due to many-body interaction on the size of the coherence peak, for both s ++ and s ±-wave superconducting states. We focus on Ba(Fe 1xCo x) 2As 2, and systematically evaluate γ in the normal state from the experimental resistivity, from optimally to overdoped compounds. Next, γ in the superconducting state is calculated microscopically based on second-order perturbation theory. In optimally doped compounds (T c30K), it is revealed that the coherence peak on 1/T 1T is completely suppressed due to large γ for both s ++ and s ±-wave states. On the other hand, in heavily overdoped compounds with T cc is quickly suppressed in proportion to . By making careful comparison between theoretical and experimental results, we conclude that it is difficult to discriminate between s ++ and s ±-wave states from the present experimental results.
AB - We present a microscopic study of the nuclear magnetic relaxation rate 1/T 1 based on the five-orbital model for iron-based superconductors. We mainly discuss the effect of the inelastic quasi-particle damping rate γ due to many-body interaction on the size of the coherence peak, for both s ++ and s ±-wave superconducting states. We focus on Ba(Fe 1xCo x) 2As 2, and systematically evaluate γ in the normal state from the experimental resistivity, from optimally to overdoped compounds. Next, γ in the superconducting state is calculated microscopically based on second-order perturbation theory. In optimally doped compounds (T c30K), it is revealed that the coherence peak on 1/T 1T is completely suppressed due to large γ for both s ++ and s ±-wave states. On the other hand, in heavily overdoped compounds with T cc is quickly suppressed in proportion to . By making careful comparison between theoretical and experimental results, we conclude that it is difficult to discriminate between s ++ and s ±-wave states from the present experimental results.
UR - http://www.scopus.com/inward/record.url?scp=84863929562&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84863929562&partnerID=8YFLogxK
U2 - 10.1088/0953-2048/25/8/084006
DO - 10.1088/0953-2048/25/8/084006
M3 - Article
AN - SCOPUS:84863929562
VL - 25
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
SN - 0953-2048
IS - 8
M1 - 084006
ER -