Evidence of unconventional low-frequency dynamics in the normal phase of Ba(Fe1-xRhx)2As2 iron-based superconductors

L. Bossoni; P. Carretta; W. P. Halperin; S. Oh; A. Reyes; P. Kuhns; P. C. Canfield

doi:10.1103/PhysRevB.88.100503

Evidence of unconventional low-frequency dynamics in the normal phase of Ba(Fe_1-xRh_x)₂As₂ iron-based superconductors

L. Bossoni^*, P. Carretta, W. P. Halperin, S. Oh, A. Reyes, P. Kuhns, P. C. Canfield

^*Corresponding author for this work

Physics and Astronomy

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

17 Scopus citations

Abstract

This work presents 75As NMR spin-echo decay rate (1/T₂) measurements in Ba(Fe_1-xRh_x)₂As₂ superconductors, for 0.041≤x≤0.094. It is shown that 1/T₂ increases upon cooling, in the normal phase, suggesting the onset of an unconventional very low-frequency activated dynamic. The correlation times of the fluctuations and their energy barriers are derived. The motion is favored at large Rh content, while it is hindered by the application of a magnetic field perpendicular to the FeAs layers. The same dynamic is observed in the spin-lattice relaxation rate, in a quantitatively consistent manner. These results are discussed in the light of nematic fluctuations involving domain wall motion. The analogies with the behavior observed in the cuprates are also outlined.

Original language	English (US)
Article number	100503
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	88
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.88.100503
State	Published - Sep 20 2013

Funding

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.88.100503

Cite this

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title = "Evidence of unconventional low-frequency dynamics in the normal phase of Ba(Fe1-xRhx)2As2 iron-based superconductors",

abstract = "This work presents 75As NMR spin-echo decay rate (1/T2) measurements in Ba(Fe1-xRhx)2As2 superconductors, for 0.041≤x≤0.094. It is shown that 1/T2 increases upon cooling, in the normal phase, suggesting the onset of an unconventional very low-frequency activated dynamic. The correlation times of the fluctuations and their energy barriers are derived. The motion is favored at large Rh content, while it is hindered by the application of a magnetic field perpendicular to the FeAs layers. The same dynamic is observed in the spin-lattice relaxation rate, in a quantitatively consistent manner. These results are discussed in the light of nematic fluctuations involving domain wall motion. The analogies with the behavior observed in the cuprates are also outlined.",

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AU - Bossoni, L.

AU - Carretta, P.

AU - Halperin, W. P.

AU - Oh, S.

AU - Reyes, A.

AU - Kuhns, P.

AU - Canfield, P. C.

PY - 2013/9/20

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N2 - This work presents 75As NMR spin-echo decay rate (1/T2) measurements in Ba(Fe1-xRhx)2As2 superconductors, for 0.041≤x≤0.094. It is shown that 1/T2 increases upon cooling, in the normal phase, suggesting the onset of an unconventional very low-frequency activated dynamic. The correlation times of the fluctuations and their energy barriers are derived. The motion is favored at large Rh content, while it is hindered by the application of a magnetic field perpendicular to the FeAs layers. The same dynamic is observed in the spin-lattice relaxation rate, in a quantitatively consistent manner. These results are discussed in the light of nematic fluctuations involving domain wall motion. The analogies with the behavior observed in the cuprates are also outlined.

AB - This work presents 75As NMR spin-echo decay rate (1/T2) measurements in Ba(Fe1-xRhx)2As2 superconductors, for 0.041≤x≤0.094. It is shown that 1/T2 increases upon cooling, in the normal phase, suggesting the onset of an unconventional very low-frequency activated dynamic. The correlation times of the fluctuations and their energy barriers are derived. The motion is favored at large Rh content, while it is hindered by the application of a magnetic field perpendicular to the FeAs layers. The same dynamic is observed in the spin-lattice relaxation rate, in a quantitatively consistent manner. These results are discussed in the light of nematic fluctuations involving domain wall motion. The analogies with the behavior observed in the cuprates are also outlined.

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