Effect of inelastic scattering on the nuclear magnetic relaxation rate 1/T 1T in iron-based superconductors

Youichi Yamakawa, Seiichiro Onari, Hiroshi Kontani

Research output: Contribution to journalArticle

2 Citations (Scopus)

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 languageEnglish
Article number084006
JournalSuperconductor Science and Technology
Volume25
Issue number8
DOIs
Publication statusPublished - Aug 2012
Externally publishedYes

Fingerprint

Magnetic relaxation
Inelastic scattering
magnetic relaxation
inelastic scattering
iron
elementary excitations
proportion
perturbation theory
Damping
damping
orbitals
electrical resistivity
Iron-based Superconductors
interactions

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 journalArticle

@article{29ae01b3fc594f0c86d2ecf3852d05c1,
title = "Effect of inelastic scattering on the nuclear magnetic relaxation rate 1/T 1T in iron-based superconductors",
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.",
author = "Youichi Yamakawa and Seiichiro Onari and Hiroshi Kontani",
year = "2012",
month = "8",
doi = "10.1088/0953-2048/25/8/084006",
language = "English",
volume = "25",
journal = "Superconductor Science and Technology",
issn = "0953-2048",
publisher = "IOP Publishing Ltd.",
number = "8",

}

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 -