Normal-state spin dynamics in the iron-pnictide superconductors BaFe 2(As1-xPx)2 and Ba(Fe 1-xCox)2As2 probed with NMR measurements

Y. Nakai, T. Iye, S. Kitagawa, K. Ishida, S. Kasahara, T. Shibauchi, Y. Matsuda, H. Ikeda, T. Terashima

Research output: Contribution to journalArticle

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Abstract

The NMR results in iron pnictides BaFe2(As1-xP x)2 and Ba(Fe1-xCox) 2As2 are analyzed based on the self-consistent renormalization (SCR) spin-fluctuation theory. The temperature dependence of the NMR relaxation rate T1-1 as well as the electrical resistivity is well reproduced by a SCR model where two-dimensional antiferromagnetic (AF) spin fluctuations are dominant. The successful description of the crossover feature from non-Fermi-liquid to Fermi-liquid behavior strongly suggests that low-lying spin fluctuations in BaFe2(As1-xPx)2 and Ba(Fe1-xCox)2As2 possess an itinerant AF nature, and that chemical substitution in the two compounds tunes the distance of these systems to an AF quantum critical point. The close relationship between spin fluctuations and superconductivity is discussed compared with the other unconventional superconductors, cuprate and heavy fermion superconductors. In addition, it is suggested that magnetism and lattice instability in these pnictides are strongly linked via orbital degrees of freedom.

Original languageEnglish
Article number174507
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number17
DOIs
Publication statusPublished - May 10 2013
Externally publishedYes

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Spin dynamics
Spin fluctuations
Group 5A compounds
spin dynamics
Superconducting materials
Iron
Nuclear magnetic resonance
iron
nuclear magnetic resonance
Heavy fermion superconductors
Fermi liquids
fluctuation theory
heavy fermion superconductors
Magnetism
Superconductivity
two dimensional models
cuprates
critical point
crossovers
Substitution reactions

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Normal-state spin dynamics in the iron-pnictide superconductors BaFe 2(As1-xPx)2 and Ba(Fe 1-xCox)2As2 probed with NMR measurements. / Nakai, Y.; Iye, T.; Kitagawa, S.; Ishida, K.; Kasahara, S.; Shibauchi, T.; Matsuda, Y.; Ikeda, H.; Terashima, T.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 87, No. 17, 174507, 10.05.2013.

Research output: Contribution to journalArticle

Nakai, Y. ; Iye, T. ; Kitagawa, S. ; Ishida, K. ; Kasahara, S. ; Shibauchi, T. ; Matsuda, Y. ; Ikeda, H. ; Terashima, T. / Normal-state spin dynamics in the iron-pnictide superconductors BaFe 2(As1-xPx)2 and Ba(Fe 1-xCox)2As2 probed with NMR measurements. In: Physical Review B - Condensed Matter and Materials Physics. 2013 ; Vol. 87, No. 17.
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AU - Ishida, K.

AU - Kasahara, S.

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AB - The NMR results in iron pnictides BaFe2(As1-xP x)2 and Ba(Fe1-xCox) 2As2 are analyzed based on the self-consistent renormalization (SCR) spin-fluctuation theory. The temperature dependence of the NMR relaxation rate T1-1 as well as the electrical resistivity is well reproduced by a SCR model where two-dimensional antiferromagnetic (AF) spin fluctuations are dominant. The successful description of the crossover feature from non-Fermi-liquid to Fermi-liquid behavior strongly suggests that low-lying spin fluctuations in BaFe2(As1-xPx)2 and Ba(Fe1-xCox)2As2 possess an itinerant AF nature, and that chemical substitution in the two compounds tunes the distance of these systems to an AF quantum critical point. The close relationship between spin fluctuations and superconductivity is discussed compared with the other unconventional superconductors, cuprate and heavy fermion superconductors. In addition, it is suggested that magnetism and lattice instability in these pnictides are strongly linked via orbital degrees of freedom.

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