Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

9-1-2013

Journal or Book Title

Physical Review B

Volume

88

Issue

10

First Page

100503

DOI

10.1103/PhysRevB.88.100503

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.

Comments

This article is published as Bossoni, L., P. Carretta, William P. Halperin, S. Oh, A. Reyes, P. Kuhns, and P. C. Canfield. "Evidence of unconventional low-frequency dynamics in the normal phase of Ba (Fe 1− x Rh x) 2 As 2 iron-based superconductors." Physical Review B 88, no. 10 (2013): 100503. DOI: 10.1103/PhysRevB.88.100503. Posted wtih permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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