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

doi:10.1103/PhysRevB.87.174507

Normal-state spin dynamics in the iron-pnictide superconductors BaFe ₂(As_1-xP_x)₂ and Ba(Fe _1-xCo_x)₂As₂ probed with NMR measurements

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

Faculty of Science

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

The NMR results in iron pnictides BaFe₂(As_1-xP _x)₂ and Ba(Fe_1-xCo_x) 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(As_1-xP_x)₂ and Ba(Fe_1-xCo_x)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 language	English
Article number	174507
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	87
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.87.174507
Publication status	Published - May 10 2013

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Nakai, Y., Iye, T., Kitagawa, S., Ishida, K., Kasahara, S., Shibauchi, T., Matsuda, Y., Ikeda, H., & Terashima, T. (2013). Normal-state spin dynamics in the iron-pnictide superconductors BaFe ₂(As_1-xP_x)₂ and Ba(Fe _1-xCo_x)₂As₂ probed with NMR measurements. Physical Review B - Condensed Matter and Materials Physics, 87(17), [174507]. https://doi.org/10.1103/PhysRevB.87.174507

Normal-state spin dynamics in the iron-pnictide superconductors BaFe ₂(As_1-xP_x)₂ and Ba(Fe _1-xCo_x)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 journal › Article › peer-review

Nakai, Y, Iye, T, Kitagawa, S, Ishida, K, Kasahara, S, Shibauchi, T, Matsuda, Y, Ikeda, H & Terashima, T 2013, 'Normal-state spin dynamics in the iron-pnictide superconductors BaFe ₂(As_1-xP_x)₂ and Ba(Fe _1-xCo_x)₂As₂ probed with NMR measurements', Physical Review B - Condensed Matter and Materials Physics, vol. 87, no. 17, 174507. https://doi.org/10.1103/PhysRevB.87.174507

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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.",

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AU - Ishida, K.

AU - Kasahara, S.

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N2 - 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.

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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